Electrochemistry
117 JEE Chemistry previous year questions on Electrochemistry — options free on every question; 12 include the answer & explanation free, the rest unlock with PYQ Pass.
\({\mathrm{E}}_{{\mathrm{Cr}}_{2}{\mathrm{O}}_{7}^{2-}/{\mathrm{Cr}}^{3+}}^{\mathrm{o}}=1.33\mathrm{V}{\mathrm{E}}_{{\mathrm{Cl}}_{2}/{\mathrm{Cl}}^{-}}^{\mathrm{o}}=1.36\mathrm{V}\\ {\mathrm{E}}_{{\mathrm{MnO}}_{4}^{-}/{\mathrm{Mn}}^{2+}}^{\mathrm{o}}=1.51\mathrm{V}{\mathrm{E}}_{{\mathrm{Cr}}^{3+}/\mathrm{Cr}}^{\mathrm{o}}=-0.74\mathrm{V}\)
Mark the strongest reducing agent.
(Memory Based JEE Mains 24/01/2025 ,Shift -2)
Cr
Greater the reduction potential , lesser will be the tendency to act as reducing agent
\({O}_{2}\) gas will be evolved as a product of electrolysis of
(A) an aqueous solution of \(AgN{O}_{3}\) using silver electrodes.
(B) an aqueous solution of \(AgN{O}_{3}\) using platinum electrodes.
(C) a dilute solution of \({H}_{2}S{O}_{4}\) using platinum electrodes.
(D) a high concentration solution of \({H}_{2}S{O}_{4}\) using platinum electrodes.
Choose the correct answer from the options given below
[JEE Main 2025, 29 Jan (Shift 2)]
(B) and (C) only
Oxygen gas is evolved during the electrolysis of aqueous \(AgN{O}_{3}\) with platinum electrodes and dilute \({H}_{2}S{O}_{4}\)with platinum electrodes.
Electrolysis of which compound give \({\mathrm{H}}_{2}{\mathrm{S}}_{2}{\mathrm{O}}_{8}\\\)
(Memory Based JEE Mains 22/01/2025,Shift -1)
Electrolysis of conc.\({\text{H}}_{2}{\mathrm{SO}}_{4}\)
\(\mathrm{The}\mathrm{electrolysis}\mathrm{of}\mathrm{conc}{\mathrm{H}}_{2}{\mathrm{SO}}_{4}\mathrm{give}\mathrm{oleum}({\mathrm{H}}_{2}{\mathrm{S}}_{2}{\mathrm{O}}_{8})\).
Identify the factor from the following that does not affect electolytic conductance of a solution.
The nature of the electrode used
-
Nature of electrolyte → determines type and number of ions ✅
-
Nature of solvent → affects ionization and mobility ✅
-
Concentration of electrolyte → changes number of free ions ✅
-
Nature of electrode used → electrodes only allow current to pass; they don’t affect ionic conductance of the solution itself ❌
✅ Correct Answer: (B) The nature of the electrode used
A solution of aluminium chloride is electrolysed for 30 minutes using a current of 2 A . The amount of the aluminium deposited at the cathode is ________.
[Given : molar mass of aluminium and chlorine are \(27gmo{l}^{-1}\) and \(35.5gmo{l}^{-1}\) respectively]
[JEE Main 2025, 22 Jan (Shift 1)]
0.336 g
Using Faraday's laws of electrolysis,
\(W=Z\times I\times t\)
Given:
\(I=2A,t=30min=30\times 60sec\)
\(∴W=\frac{M}{nF}\times I\times t\left(∵Z=\frac{M}{nF}\right)\\ W=\frac{27}{3\times 96500}\times 2\times 30\times 60\)
\(W=0.336g\)
Fuel cell, using hydrogen and oxygen as fuels,
A. has been used in spaceship
B. has as efficiency of \(40\%\) to produce electricity
C. uses aluminum as catalysts
D. is eco-friendly
E. is actually a type of Galvanic cell only
Choose the correct answer from the options given below
[JEE Main 2024, 4 Apr (Shift 2)]
A, B, D, E only
A. has been used in spaceship ✅
Yes, hydrogen–oxygen fuel cells were used in Apollo missions.
B. has an efficiency of 40% to produce electricity ✅
Fuel cells typically have efficiencies around 40–60%; 40% is acceptable.
C. uses aluminium as catalysts ❌
Catalyst used is platinum (Pt), not aluminium.
D. is eco-friendly ✅
Product is water, so it is environmentally friendly.
E. is actually a type of Galvanic cell only ✅
Fuel cell is a galvanic (voltaic) cell producing electrical energy from a spontaneous redox reaction.
Correct option: 🔹 D
On charging the lead storage battery, the oxidation state of lead changes from \({x}_{1}\) to \({y}_{1}\) at the anode and from \({x}_{2}\) to \({y}_{2}\) at the cathode. The values of \({\mathrm{x}}_{1},{\mathrm{y}}_{1},{\mathrm{x}}_{2},{\mathrm{y}}_{2}\) are respectively
+2,0,+2,+4
On charging , lead storage battery
PbSO4 → Pb at anode
PbSO4 → PbO2 at cathode
Given below are two statements :
Statement I : Mohr's salt is composed of only three types of ions-ferrous, ammonium and sulphate.
Statement II : If the molar conductance at infinite dilution of ferrous, ammonium and sulphate ions are \({\mathrm{x}}_{1},{\mathrm{x}}_{2}\) and \({\mathrm{x}}_{3}\mathrm{S}{\mathrm{cm}}^{2}{\mathrm{mol}}^{-1}\), respectively then the molar conductance for Mohr's salt solution at infinite dilution would be given by \({\mathrm{x}}_{1}+{\mathrm{x}}_{2}+2{\mathrm{x}}_{3}\)
In the light of the given statements, choose the correct answer from the options given below
[JEE Main 2025, 7 Apr (Shift 1)]
Statement I is true but Statement II are false
Mohr's salt : FeSO4(NH4)2SO4.6H2O
Using Kohlrousch law
\({\lambda }_{\mathrm{m}}^{\infty }\)(Mohr's salt) = x1 + 2x2 + 2x3
Conductivity values (S m⁻¹) at 298 K:
2.1×10³, 1.0×10⁻¹⁶, 1.2×10⁻³, 3.91, 1.5×10⁻², 1×10⁻⁷, 1.0×10³
Find number of conductors
[JEE Main 2024, 31 Jan (Shift 2)]
4
Classification based on conductivity:
Conductors: conductivity ≈ 10³ S m⁻¹ or higher
Semiconductors: intermediate (10⁻⁶ to 10² approx)
Insulators: very low (≈10⁻¹⁰ or less)
2.1×10³ → conductor
1.0×10⁻¹⁶ → insulator
1.2×10⁻³ → semiconductor
3.91 → this is relatively high → conductor (ionic conductor)
1.5×10⁻² → semiconductor
1×10⁻⁷ → semiconductor/insulator borderline
1.0×10³ → conductor
Electrolytes (like aqueous ionic solutions) with conductivity in range of ~1–10 S m⁻¹ are also considered conductors, not semiconductors.
Thus:
Conductors:
2.1×10³
3.91
1.0×10³
1.5×10⁻² (weak electrolyte → still conductor)
Total = 4
Consider the following
\({\mathrm{E}}^{0}\mathrm{Value}\mathrm{for}\mathrm{the}\mathrm{given}\mathrm{half}\mathrm{cell}\\ {{\mathrm{E}}^{0}}_{{\mathrm{Ag}}^{+}/\mathrm{Ag}}=0.8\mathrm{V},{{\mathrm{E}}^{0}}_{{\mathrm{Zn}}^{2+}/\mathrm{Zn}}=-0.76\mathrm{V}\\ {{\mathrm{E}}^{0}}_{{\mathrm{Cu}}^{2+}/\mathrm{Cu}}=0.34\mathrm{V}{{\mathrm{E}}^{0}}_{{\mathrm{Mg}}^{2+}/\mathrm{Mg}}=-2.35\mathrm{V}\\ \mathrm{Then}\mathrm{which}\mathrm{of}\mathrm{the}\mathrm{following}\mathrm{will}\mathrm{have}\mathrm{the}\mathrm{most}\mathrm{negative}\mathrm{value}\mathrm{of}∆{\mathrm{G}}^{0}?\)
(Memory Based JEE Mains 23/01/2025 ,Shift -2)
\(Mg|M{g}^{2+}∥A{g}^{+}|Ag\)
The cell which has most positive value of will have most negative value of.
\({{\mathrm{E}}_{\mathrm{cell}}^{\mathrm{o}}={\mathrm{E}}^{0}}_{{\mathrm{Ag}}^{+}/\mathrm{Ag}}-{{\mathrm{E}}^{0}}_{{\mathrm{Mg}}^{2+}/\mathrm{Mg}}\\ =0.8\mathrm{V}-(-2.35\mathrm{V})=3.15\mathrm{V}\\ ∆{\mathrm{G}}^{0}=-{\mathrm{nFE}}_{\mathrm{cell}}^{\mathrm{o}}\)
What pressure (bar) of \({H}_{2}\) would be required to make emf of hydrogen electrode zero in pure water at \(25^\circ C\) ?
[JEE Main 2024, 4 Apr (Shift 1)]
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For the electro chemical cell
\(M\left|{M}^{2+}\right||X|{X}^{2-}\)
\(\text{ If }{E}_{\left({M}^{2+}/M\right)}^{0}=0.46V\text{ and }{E}_{\left(x/{x}^{2-}\right)}^{0}=0.34V\text{. }\)
Which of the following is correct?
[JEE Main 2024, 5 Apr (Shift 2)]
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Given below are two statements
Statement(I): Corrosion is an electrochemical phenomenon in which pure metal acts as an anode, impure metal as a cathode.
Statement(II): The rate of corrosion is more in alkaline medium than in acidic medium
In the light of above statements, choose the correct answer from options given below
[JEE Main 2025, 22 Jan (Shift 2)]
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\({O}_{2}\) gas will be evolved as a product of electrolysis of :
(A) an aqueous solution of \(AgN{O}_{3}\) using silver electrodes.
(B) an aqueous solution of \(AgN{O}_{3}\) using platinum electrodes.
(C) a dilute solution of \({H}_{2}S{O}_{4}\) using platinum electrodes.
(D) a high concentration solution of \({H}_{2}S{O}_{4}\) using platinum electrodes.
Choose the correct answer from the options given below :
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Correct order of limiting molar conductivity for cations in water at \(298K\) is
[JEE Main 2025, 3 Apr (Shift 1)]
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For a strong electrolyte, a plot of molar conductivity against \({\text{(concentration)}}^{1/2}\) is a straight line, with a negative slope, the correct unit for the slope isEndFragment
[JEE Main 2024, 04 Apr (Shift 2)]
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For a strong electrolyte, a plot of molar conductivity against \({\text{(concentration)}}^{1/2}\) is a straight line, with a negative slope, the correct unit for the slope isEndFragment
[JEE Main 2024, 04 Apr (Shift 2)]
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\({\mathrm{E}}_{{\mathrm{Cr}}_{2}{\mathrm{O}}_{7}^{2-}/{\mathrm{Cr}}^{3+}}^{\mathrm{o}}=1.33\mathrm{V}{\mathrm{E}}_{{\mathrm{Cl}}_{2}/{\mathrm{Cl}}^{-}}^{\mathrm{o}}=1.36\mathrm{V}\\ {\mathrm{E}}_{{\mathrm{MnO}}_{4}^{-}/{\mathrm{Mn}}^{2+}}^{\mathrm{o}}=1.51\mathrm{V}{\mathrm{E}}_{{\mathrm{Cr}}^{3+}/\mathrm{Cr}}^{\mathrm{o}}=-0.74\mathrm{V}\)
Mark the strongest reducing agent.
(Memory Based JEE Mains 24/01/2025 ,Shift -2)
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\({\mathrm{Fe}}^{2+}+{\mathrm{Ag}}^{+}\to {\mathrm{Fe}}^{3+}+\mathrm{Ag};{\mathrm{E}}_{\mathrm{net}}^{\mathrm{o}}\mathrm{______}?\\ {\mathrm{Ag}}^{+}+{\mathrm{e}}^{-}\to \mathrm{Ag};{\mathrm{E}}^{\mathrm{o}}=\mathrm{x}\\ {\mathrm{Fe}}^{2+}+2{\mathrm{e}}^{-}\to \mathrm{Fe};{\mathrm{E}}^{\mathrm{o}}=\mathrm{y}\\ {\mathrm{Fe}}^{3+}+3{\mathrm{e}}^{-}\to \mathrm{Fe};{\mathrm{E}}^{\mathrm{o}}=\mathrm{z}\\ \mathrm{The}\mathrm{value}\mathrm{of}{\mathrm{E}}_{\mathrm{net}}^{\mathrm{o}}=?\)
(Memory Based 24/ 01/25 Shift-1 )
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For a \(Mg\left|M{g}^{2+}(aq)\right|\left|A{g}^{+}(aq)\right|Ag\) the correct Nernst Equation is
[JEE Main 2025, 29 Jan (Shift 1)]
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On charging the lead storage battery, the oxidation state of lead changes from \({x}_{1}\) to \({y}_{1}\) at the anode and from \({x}_{2}\) to \({y}_{2}\) at the cathode. The values of \({\mathrm{x}}_{1},{\mathrm{y}}_{1},{\mathrm{x}}_{2},{\mathrm{y}}_{2}\) are respectively
[JEE Main 2025, 4 Apr (Shift 1)]
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One of the commonly used electrode is calomel electrode. Under which of the following categories, calomel electrode comes?
[JEE Main 2024, 04 Apr (Shift 1)]
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One of the commonly used electrode is calomel electrode. Under which of the following categories, calomel electrode comes?
[JEE Main 2024, 04 Apr (Shift 1)]
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\({\mathrm{Fe}}^{2+}+{\mathrm{Ag}}^{+}\to {\mathrm{Fe}}^{3+}+\mathrm{Ag};{\mathrm{E}}_{\mathrm{net}}^{\mathrm{o}}\mathrm{______}?\\ {\mathrm{Ag}}^{+}+{\mathrm{e}}^{-}\to \mathrm{Ag};{\mathrm{E}}^{\mathrm{o}}=\mathrm{x}\\ {\mathrm{Fe}}^{2+}+2{\mathrm{e}}^{-}\to \mathrm{Fe};{\mathrm{E}}^{\mathrm{o}}=\mathrm{y}\\ {\mathrm{Fe}}^{3+}+3{\mathrm{e}}^{-}\to \mathrm{Fe};{\mathrm{E}}^{\mathrm{o}}=\mathrm{z}\\ \mathrm{The}\mathrm{value}\mathrm{of}{\mathrm{E}}_{\mathrm{net}}^{\mathrm{o}}=?\)
(Memory Based 24/ 01/25 Shift-1 )
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Which of the following ions is the strongest oxidizing agent (Memory based 29 Jan /2025 morning shift )
\(\mathrm{Given}:{{\mathrm{E}}^{0}}_{{\mathrm{Al}}^{3+}/\mathrm{Al}}=-2.7\mathrm{V}\\ {{\mathrm{E}}^{0}}_{{\mathrm{Cu}}^{2+}/\mathrm{Cu}}=0.34\mathrm{V}\\ {{\mathrm{E}}^{0}}_{{\mathrm{Pb}}^{4+}/{\mathrm{Pb}}^{2+}}=1.8\mathrm{V}\\ {{\mathrm{E}}^{0}}_{{\mathrm{Ti}}^{3+}/\mathrm{Ti}}=-1.21\mathrm{V}\)
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One of the commonly used electrode is calomel electrode. Under which of the following categories, calomel electrode comes?
[JEE Main 2024, 4 Apr (Shift 1)]
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Which of the following statements is not correct about rusting of iron?
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Which of the following statements is not correct about rusting of iron?
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Which of the following statements is not correct about rusting of iron?
[JEE Main 2024, 27 Jan (Shift 2)]
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The emf of cell \(Tl\left|\underset{\text{(0.001M)}}{{\text{Tl}}^{\text{+}}}\right|\left|\underset{\text{(0.01M)}}{{\text{Cu}}^{\text{2+}}}\right|\text{Cu is }0.83V\text{ at }298\text{K}.\) It could be increased by :
[JEE Main 2024, 08 Apr (Shift 2)]
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The emf of cell \(Tl\left|\underset{\text{(0.001M)}}{{\text{Tl}}^{\text{+}}}\right|\left|\underset{\text{(0.01M)}}{{\text{Cu}}^{\text{2+}}}\right|\text{Cu is }0.83V\text{ at }298\text{K}.\) It could be increased by :
[JEE Main 2024, 08 Apr (Shift 2)]
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Identify the factor from the following that does not affect electolytic conductance of a solution.
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Based on the data given below :
\({E}_{C{r}_{2}{O}_{7}^{2-}/C{r}^{3+}}^{0}=1.33V{E}_{C{l}_{2}/C{l}^{(-)}}^{0}=1.36V\\ {E}_{Mn{O}_{4}^{-}/M{n}^{2+}}^{0}=1.51V{E}_{C{r}^{3+}/Cr}^{0}=-0.74V\)
the strongest reducing agent is
[JEE Main 2025, 24 Jan (Shift 2)]
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What is the correct Nernst equation representation for the following cell reaction? (Memory based 29 Jan /2025 morning shift )
\(\mathrm{Mg}(\mathrm{s})\to {\mathrm{Mg}}^{2+}+2{\mathrm{e}}^{-}\\ {\mathrm{Ag}}^{+}+{\mathrm{e}}^{-}\to \mathrm{Ag}(\mathrm{s})\)
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Which of the following electrolyte can be used to obtain \({\mathrm{H}}_{2}{\mathrm{S}}_{2}{\mathrm{O}}_{8}\) by the process of electrolysis?
[JEE Main 2025, 22 Jan (Shift 1)]
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The quantity of silver deposited when one coulomb charge is passed through \(AgN{O}_{3}\) solution
[JEE Main 2024, 05 Apr (Shift 2)]
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The quantity of silver deposited when one coulomb charge is passed through \(AgN{O}_{3}\) solution
[JEE Main 2024, 05 Apr (Shift 2)]
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The reaction at cathode in the cells commonly used in clocks involves
[JEE Main 2024, 05 Apr (Shift 1)]
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The reaction at cathode in the cells commonly used in clocks involves
[JEE Main 2024, 05 Apr (Shift 1)]
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A solution of aluminium chloride is electrolysed for 30 minutes using a current of 2 A . The amount of the aluminium deposited at the cathode is ________.
[Given : molar mass of aluminium and chlorine are \(27gmo{l}^{-1}\) and \(35.5gmo{l}^{-1}\) respectively]
[JEE Main 2025, 22 Jan (Shift 1)]
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For the given cell
\(F{e}^{2+}{}_{(aq)}+A{g}^{+}{}_{(aq)}\to F{e}^{3+}{}_{(aq)}+A{g}_{(s)}\)
The standard cell potential of the above reaction is
Given
\(A{g}^{+}+{e}^{-}\to AgE^\circ =xV\)
\(F{e}^{2+}+2{e}^{-}\to FeE^\circ =yV\)
\(F{e}^{3+}+3{e}^{-}\to Fe{E}^{^\circ }=zV\)
[JEE Main 2025, 24 Jan (Shift 1)]
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Consider the following half cell reaction
\({\mathrm{Cr}}_{2}{\mathrm{O}}_{7}^{2-}(\mathrm{aq})+6{\mathrm{e}}^{-}+14{\mathrm{H}}^{+}(\mathrm{aq})\to 2{\mathrm{Cr}}^{3+}(\mathrm{aq})+7{\mathrm{H}}_{2}\mathrm{O}(\mathrm{l})\)
The reaction was conducted with the ratio of \(\frac{{\left[{\mathrm{Cr}}^{3+}\right]}^{2}}{\left[{\mathrm{Cr}}_{2}{\mathrm{O}}_{7}^{2-}\right]}={10}^{-6}\). The pH value at which the EMF of the half cell will become zero is _______ . (nearest integer value)
\([\)Given : standard half cell reduction potential
\(\left.{\mathrm{E}}_{{\mathrm{Cr}}_{2}{\mathrm{O}}_{7}^{2-},{\mathrm{H}}^{+}/{\mathrm{Cr}}^{3+}}^{\mathrm{o}}=1.33\mathrm{V},\frac{2.303\mathrm{RT}}{\mathrm{F}}=0.059\mathrm{V}\right]\)
[JEE Main 2025, 8 Apr (Shift 1)]
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The standard reduction potential values of some of the p-block ions are given below. Predict the one with the strongest oxidising capacity
[JEE Main 2025, 29 Jan (Shift 1)]
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The standard cell potential \(\left({\mathrm{E}}_{\text{cell }}^{⊖}\right)\) of a fuel cell based on the oxidation of methanol in air that has been used to power television relay station is measured as \(1.21V\) . The standard half cell reduction potential for \({\mathrm{O}}_{2}\left({\mathrm{E}}_{{\mathrm{O}}_{2}/{\mathrm{H}}_{2}\mathrm{O}}^{\mathrm{O}}\right)\) is \(1.229V\).Choose the correct statement:
[JEE Main 2025, 3 Apr (Shift 2)]
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Which of the following gives predominantly \({\mathrm{O}}_{2}\) on electrolysis among the following?
A) Aq. \({\mathrm{AgNO}}_{3}\) (Pt electrodes)
B) Aq. \({\mathrm{AgNO}}_{3}\) (Ag electrodes)
C) Conc.\({\mathrm{H}}_{2}{\mathrm{SO}}_{4}\) (Pt electrodes)
D) Dilute \({\mathrm{H}}_{2}{\mathrm{SO}}_{4}\)(Ag electrodes)
Memory Based Question 29/Jan/25 Evening shift
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Given below are two statements
Statement(I): Corrosion is an electrochemical phenomenon in which pure metal acts as an anode, impure metal as a cathode.
Statement(II): The rate of corrosion is more in alkaline medium than in acidic medium
In the light of above statements, choose the correct answer from options given below
[JEE Main 2025, 22 Jan (Shift 2)]
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How can an electrochemical cell be converted into an electrolytic cell?
[JEE Main 2024, 6 Apr (Shift 2)]
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Fuel cell, using hydrogen and oxygen as fuels,
A. has been used in spaceship
B. has as efficiency of \(40\%\) to produce electricity
C. uses aluminum as catalysts
D. is eco-friendly
E. is actually a type of Galvanic cell only
Choose the correct answer from the options given below
[JEE Main 2024, 4 Apr (Shift 2)]
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For the given cell
\(F{e}^{2+}{}_{(aq)}+A{g}^{+}{}_{(aq)}\to F{e}^{3+}{}_{(aq)}+A{g}_{(s)}\)
The standard cell potential of the above reaction is
Given
\(A{g}^{+}+{e}^{-}\to Ag{E}^{\theta }=xV\)
\(F{e}^{2+}+2{e}^{-}\to Fe{E}^{\theta }=yV\)
\(F{e}^{3+}+3{e}^{-}\to Fe{E}^{\theta }=zV\)
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For a \(Mg\left|M{g}^{2+}(aq)\right|\left|A{g}^{+}(aq)\right|Ag\) the correct Nernst Equation is
[JEE Main 2025, 29 Jan (Shift 1)]
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Consider the following reduction process:
\({\mathrm{Al}}^{3+}+3{\mathrm{e}}^{−}\overset{}{\to }\mathrm{Al}(\mathrm{s}),\text{ }\mathrm{E}^\circ =−1.66\text{}V\)
\({\mathrm{Fe}}^{3+}+{\mathrm{e}}^{−}\overset{}{\to }{\mathrm{Fe}}^{2+},\text{ }\mathrm{E}^\circ =+0.77\mathrm{V}\)
\({\mathrm{Co}}^{3+}+{\mathrm{e}}^{−}\overset{}{\to }{\mathrm{Co}}^{2+},\text{ }\mathrm{E}^\circ =+1.81\mathrm{V}\)
\({\mathrm{Cr}}^{3+}+3{\mathrm{e}}^{−}\overset{}{\to }\mathrm{Cr}(\mathrm{s}),\text{ }\mathrm{E}^\circ =−0.74\mathrm{V}\)
The tendency to act as reducing agent decreases in the order
[JEE Main 2026, 22 Jan (Shift 2)]
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Given below are two statements :
\(1\) M aqueous solution of each of \(\mathrm{Cu}{\left({\mathrm{NO}}_{3}\right)}_{2}\), \({\mathrm{AgNO}}_{3},{\mathrm{Hg}}_{2}{\left({\mathrm{NO}}_{3}\right)}_{2};\mathrm{Mg}{\left({\mathrm{NO}}_{3}\right)}_{2}\) are electrolysed using inert electrodes
Given : \({\mathrm{E}}_{{\mathrm{Ag}}^{+}/\mathrm{Ag}}^{\mathrm{o}}=0.80\mathrm{V},{\mathrm{E}}_{{\mathrm{Hg}}_{2}^{2+}/\mathrm{Hg}}^{\mathrm{o}}=0.79\mathrm{V}\), \({\mathrm{E}}_{{\mathrm{Cu}}^{2+}/\mathrm{Cu}}^{\mathrm{o}}=0.24\mathrm{V}\text{ and }{\mathrm{E}}_{{\mathrm{Mg}}^{2+}/\mathrm{Mg}}^{\mathrm{o}}=-2.37\mathrm{V}\)
Statement (I) : With increasing voltage, the sequence of deposition of metals on the cathode will be \(\mathrm{Ag},\mathrm{Hg}\) and \(\mathrm{Cu}\)
Statement (II) : Magnesium will not be deposited at cathode instead oxygen gas will be evolved at the cathode.
In the light of the above statement, choose the most appropriate answer from the options given below
[JEE Main 2025, 7 Apr (Shift 2)]
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In the given electrochemical cell, \(\mathrm{Ag}(\mathrm{s})|\mathrm{AgCl}(\mathrm{s})|{\mathrm{FeCl}}_{2}(\mathrm{aq}),{\mathrm{FeCl}}_{3}(\mathrm{aq})∣\mathrm{Pt}(\mathrm{s})\)
at 298 K, the cell potential (Ecell) will increase when:
(A) Concentration of Fe2+ is increased.
(B) Concentration of Fe3+ is decreased.
(C) Concentration of Fe2+ is decreased.
(D) Concentration of Fe3+ is increased.
(E) Concentration of Cl– is increased.
Choose the correct answer from the options given below
[JEE Main 2026, 23 Jan (Shift 1)]
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Correct order of limiting molar conductivity for cations in water at \(298K\) is
[JEE Main 2025, 3 Apr (Shift 1)]
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The standard cell potential \(\left({\mathrm{E}}_{\text{cell }}^{⊖}\right)\) of a fuel cell based on the oxidation of methanol in air that has been used to power television relay station is measured as \(1.21V\) . The standard half cell reduction potential for \({\mathrm{O}}_{2}\left({\mathrm{E}}_{{\mathrm{O}}_{2}/{\mathrm{H}}_{2}\mathrm{O}}^{\mathrm{O}}\right)\) is \(1.229V\).Choose the correct statement:
[JEE Main 2025, 3 Apr (Shift 2)]
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Based on the data given below :
\({E}_{C{r}_{2}{O}_{7}^{2-}/C{r}^{3+}}^{0}=1.33V{E}_{C{l}_{2}/C{l}^{(-)}}^{0}=1.36V\\ {E}_{Mn{O}_{4}^{-}/M{n}^{2+}}^{0}=1.51V{E}_{C{r}^{3+}/Cr}^{0}=-0.74V\)
the strongest reducing agent is
[JEE Main 2025, 24 Jan (Shift 2)]
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In the given electrochemical cell, \(\mathrm{Ag}(\mathrm{s})|\mathrm{AgCl}(\mathrm{s})|{\mathrm{FeCl}}_{2}(\mathrm{aq}),{\mathrm{FeCl}}_{3}(\mathrm{aq})∣\mathrm{Pt}(\mathrm{s})\)
at 298 K, the cell potential (Ecell) will increase when:
(A) Concentration of Fe2+ is increased.
(B) Concentration of Fe3+ is decreased.
(C) Concentration of Fe2+ is decreased.
(D) Concentration of Fe3+ is increased.
(E) Concentration of Cl– is increased.
Choose the correct answer from the options given below
[JEE Main 2026, 23 Jan (Shift 1)]
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Which out of the following is a correct equation to show change in molar conductivity with respect to concentration for a weak electrolyte, if the symbols carry their usual meaning
[JEE Main 2024, 09 Apr (Shift 2)]
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Which out of the following is a correct equation to show change in molar conductivity with respect to concentration for a weak electrolyte, if the symbols carry their usual meaning
[JEE Main 2024, 09 Apr (Shift 2)]
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How can an electrochemical cell be converted into an electrolytic cell
[JEE Main 2024, 6 Apr (Shift 2)]
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Identify the factor from the following that does not affect electrolytic conductance of a solution.
[JEE Main 2024, 31 Jan (Shift 1)]
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Consider the following
\({\mathrm{E}}^{0}\mathrm{Value}\mathrm{for}\mathrm{the}\mathrm{given}\mathrm{half}\mathrm{cell}\\ {{\mathrm{E}}^{0}}_{{\mathrm{Ag}}^{+}/\mathrm{Ag}}=0.8\mathrm{V},{{\mathrm{E}}^{0}}_{{\mathrm{Zn}}^{2+}/\mathrm{Zn}}=-0.76\mathrm{V}\\ {{\mathrm{E}}^{0}}_{{\mathrm{Cu}}^{2+}/\mathrm{Cu}}=0.34\mathrm{V}{{\mathrm{E}}^{0}}_{{\mathrm{Mg}}^{2+}/\mathrm{Mg}}=-2.35\mathrm{V}\\ \mathrm{Then}\mathrm{which}\mathrm{of}\mathrm{the}\mathrm{following}\mathrm{will}\mathrm{have}\mathrm{the}\mathrm{most}\mathrm{negative}\mathrm{value}\mathrm{of}∆{\mathrm{G}}^{0}?\)
(Memory Based JEE Mains 23/01/2025 ,Shift -2)
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Given below are two statements
Statement(I): Corrosion is an electrochemical phenomenon in which pure metal acts as an anode, impure metal as a cathode.
Statement(II): The rate of corrosion is more in alkaline medium than in acidic medium
In the light of above statements, choose the correct answer from options given below
[JEE Main 2025, 22 Jan (Shift 2)]
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\(0.2\%(\mathrm{w}/\mathrm{v})\) solution of \(\mathrm{NaOH}\) is measured to have resistivity \(870.0\mathrm{m}\Omega \mathrm{m}\). The molar conductivity of the solution will be ________ \(\times {10}^{2}\mathrm{mS}{\mathrm{dm}}^{2}{\mathrm{mol}}^{-1}\). (Nearest integer)
[JEE Main 2025, 2 Apr (Shift 2)]
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In an electrochemical cell, dichromate ions in aqueous acidic medium are reduced to \({\mathrm{Cr}}^{3+}\). The current (in amperes) that flows through the cell for 48.25 minutes to produce 1 mole of \({\mathrm{Cr}}^{3+}\) is
Use: 1 Faraday \(=96500{\mathrm{Cmol}}^{-1}\)
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Given below are two statements :
Statement I : Mohr's salt is composed of only three types of ions-ferrous, ammonium and sulphate.
Statement II : If the molar conductance at infinite dilution of ferrous, ammonium and sulphate ions are \({\mathrm{x}}_{1},{\mathrm{x}}_{2}\) and \({\mathrm{x}}_{3}\mathrm{S}{\mathrm{cm}}^{2}{\mathrm{mol}}^{-1}\), respectively then the molar conductance for Mohr's salt solution at infinite dilution would be given by \({\mathrm{x}}_{1}+{\mathrm{x}}_{2}+2{\mathrm{x}}_{3}\)
In the light of the given statements, choose the correct answer from the options given below
[JEE Main 2025, 7 Apr (Shift 1)]
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The standard reduction potential values of some of the p-block ions are given below. Predict the one with the strongest oxidising capacity
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Which of the following has least tendency to liberate \({H}_{2}\) from mineral acids?
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Given below are two statements. Select the correct option (memory based jee mains shift-2 22/01/2025)
Statement-1: In corrosion pure metal acts as anode, the impure metal acts as a cathode
Statement-2: Alkaline medium increases the rate of corrosion more than in acidic medium
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Consider the following reduction process:
\({\mathrm{Al}}^{3+}+3{\mathrm{e}}^{−}\overset{}{\to }\mathrm{Al}(\mathrm{s}),\text{ }\mathrm{E}^\circ =−1.66\text{}V\)
\({\mathrm{Fe}}^{3+}+{\mathrm{e}}^{−}\overset{}{\to }{\mathrm{Fe}}^{2+},\text{ }\mathrm{E}^\circ =+0.77\mathrm{V}\)
\({\mathrm{Co}}^{3+}+{\mathrm{e}}^{−}\overset{}{\to }{\mathrm{Co}}^{2+},\text{ }\mathrm{E}^\circ =+1.81\mathrm{V}\)
\({\mathrm{Cr}}^{3+}+3{\mathrm{e}}^{−}\overset{}{\to }\mathrm{Cr}(\mathrm{s}),\text{ }\mathrm{E}^\circ =−0.74\mathrm{V}\)
The tendency to act as reducing agent decreases in the order
[JEE Main 2026, 22 Jan (Shift 2)]
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Standard electrode potentials for a few half cells are mentioned below
\({\text{E}}_{C{u}^{2+}/Cu}^{∘}=0.34\text{V},{\text{E}}_{Z{n}^{2+}/Zn}^{∘}=−0.76\text{V}\)
\({\text{E}}_{A{g}^{+}/Ag}^{∘}=0.80\text{V},{\text{E}}_{M{g}^{2+}/Mg}^{∘}=−2.37\text{V}\)
Which one of the following cells give the most negative value of \(∆{\mathrm{G}}^{\mathrm{o}}\)?
[JEE Main 2025, 23 Jan (Shift 2)]
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Which of the following ions is the strongest oxidizing agent (Memory based 29 Jan /2025 morning shift )
\(\mathrm{Given}:{{\mathrm{E}}^{0}}_{{\mathrm{Al}}^{3+}/\mathrm{Al}}=-2.7\mathrm{V}\\ {{\mathrm{E}}^{0}}_{{\mathrm{Cu}}^{2+}/\mathrm{Cu}}=0.34\mathrm{V}\\ {{\mathrm{E}}^{0}}_{{\mathrm{Pb}}^{4+}/{\mathrm{Pb}}^{2+}}=1.8\mathrm{V}\\ {{\mathrm{E}}^{0}}_{{\mathrm{Ti}}^{3+}/\mathrm{Ti}}=-1.21\mathrm{V}\)
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The reaction ;
\(\frac{1}{2}{H}_{2(g)}+AgC{l}_{(s)}\to {H}_{(aq)}^{+}+C{l}_{(aq)}^{-}+A{g}_{(s)}\)
occurs in which of the following galvanic cell :
[JEE Main 2024, 8 Apr (Shift 2)]
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Which of the following gives predominantly \({\mathrm{O}}_{2}\) on electrolysis among the following?
A) Aq. \({\mathrm{AgNO}}_{3}\) (Pt electrodes)
B) Aq. \({\mathrm{AgNO}}_{3}\) (Ag electrodes)
C) Conc.\({\mathrm{H}}_{2}{\mathrm{SO}}_{4}\) (Pt electrodes)
D) Dilute \({\mathrm{H}}_{2}{\mathrm{SO}}_{4}\)(Ag electrodes)
Memory Based Question 29/Jan/25 Evening shift
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Which of the following has least tendency to liberate \({H}_{2}\) from mineral acids?
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Which of the following electrolyte can be used to obtain \({\mathrm{H}}_{2}{\mathrm{S}}_{2}{\mathrm{O}}_{8}\) by the process of electrolysis?
[JEE Main 2025, 22 Jan (Shift 1)]
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The reaction ;
\(\frac{1}{2}{H}_{2(g)}+AgC{l}_{(s)}\to {H}_{(aq)}^{+}+C{l}_{(aq)}^{-}+A{g}_{(s)}\)
occurs in which of the following galvanic cell :
[JEE Main 2024, 8 Apr (Shift 2)]
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Electrolysis of 600 mL aqueous solution of NaCl for 5 min changes the pH of the solution to 12 . The current in Amperes used for the given electrolysis is ______ (Nearest integer)
[JEE Main 2025, 28 Jan (Shift 2)]
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One of the commonly used electrode is calomel electrode. Under which of the following categories, calomel electrode comes?
[JEE Main 2024, 4 Apr (Shift 1)]
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Reduction potential of ions are given below:
\({\mathrm{ClO}}_{4}^{–}{\mathrm{IO}}_{4}^{–}{\mathrm{BrO}}_{4}^{–}\\ \mathrm{E}^\circ =1.19\mathrm{V}\mathrm{E}^\circ =1.65\mathrm{V}\mathrm{E}^\circ =1.74\mathrm{V}\)
The correct order their oxidizing power is:
[JEE Main 2024, 30 Jan (Shift 2)]
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What is the correct Nernst equation representation for the following cell reaction? (Memory based 29 Jan /2025 morning shift )
\(\mathrm{Mg}(\mathrm{s})\to {\mathrm{Mg}}^{2+}+2{\mathrm{e}}^{-}\\ {\mathrm{Ag}}^{+}+{\mathrm{e}}^{-}\to \mathrm{Ag}(\mathrm{s})\)
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A metal surface of \(100 \mathrm{~cm}^{2}\) area has to be coated with nickel layer of thickness \(0.001 \mathrm{~mm}\). A current of \(2 \mathrm{~A}\) was passed through a solution of \(\mathrm{Ni}\left(\mathrm{NO}_{3}\right)_{2}\) for ' \(x\) ' seconds to coat the desired layer. The value of \(x\) is........................... (Nearest integer)
\(\left(\mathrm{p}_{\mathrm{Ni}}\right.\) (density of Nickel) is \(10{\mathrm{g}\mathrm{mL}}^{-1}\), Molar mass of Nickel is \(60 \mathrm{~gmol}^{-1} \mathrm{~F}=96500 \mathrm{~C} \mathrm{mol}^{-1}\) )
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The molar conductance of \( \mathrm{NaCl}, \mathrm{HCl} \) and \( \mathrm{CH}_{3} \mathrm{COONa} \) at infinite dilution are \( 126.45 \)\(,\) \( 426.16 \) and \( 91.0 \mathrm{~S} \mathrm{~cm}^{2} \mathrm{~mol}^{-1} \) respectively. The molar conductance of \( \mathrm{CH}_{3} \mathrm{COOH} \) at infinite dilution is:
[NEET 2021]
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The photoelectric current from \(\mathrm{Na}\) (work function, \(\mathrm{w}_{\mathrm{o}}=2.3 \mathrm{~eV}\) ) is stopped by the output voltage of the cell
\(\mathrm{Pt}(\mathrm{s}) / \mathrm{H}_{2}\) (g, 1 bar) \(\mid \mathrm{HCl}\) (aq., \(\mathrm{pH}=1\) ) \(|\mathrm{AgCl}(\mathrm{s})| \mathrm{Ag}\) (s)
The \(\mathrm{pH}\) of aq. \(\mathrm{HCl}\) required to stop the photoelectric current from \(\mathrm{K}\left(\mathrm{w}_{o}=2.25 \mathrm{~eV}\right)\), all other conditions remaining the same, is________ \(\times 10^{-2}\) (to the nearest integer).
Given:
\(2.303 \frac{\mathrm{RT}}{\mathrm{F}}=0.06 \mathrm{~V} ; \mathrm{E}_{\mathrm{AgCl}|\mathrm{Ag}| \mathrm{Cl^-}}^{\circ}=0.22 \mathrm{~V}\)
[JEE Main 2020, 3 Sep (Shift 1)]
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In an electrochemical reaction of lead, at standard temperature, if \(\mathrm{E}_{\left(\mathrm{Pb}^{2+} / \mathrm{Pb}\right)}^{\circ}=\mathrm{m}\) Volt and \(\mathrm{E}_{\left(\mathrm{Pb}^{4+} / \mathrm{Pb}\right)}^{\circ}=\mathrm{n}\) Volt , then the value of \(\mathrm{E}_{\left(\mathrm{Pb}^{2+} / \mathrm{Pb}^{4+}\right)}^{\circ}\) is given by \(\mathrm{m}-\mathrm{xn}\). The value of \(\mathrm{x}\) is ___. (Nearest integer)
[JEE Main 2023, 11 Apr (Shift 1)]
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Given that the standard potentials \( \left(\mathrm{E}^{\circ}\right) \) of \( \mathrm{Cu}^{2+} / \mathrm{Cu} \) and \( \mathrm{Cu}^{+} / \mathrm{Cu} \) are \( 0.34 \mathrm{~V} \) and \( 0.522 \mathrm{~V} \) respectively, the \( \mathrm{E}^{\circ} \) of \( \mathrm{Cu}^{2+} / \mathrm{Cu}^{+} \)is:
[JEE Main 2020, 7 Jan (Shift 1)]
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Consider the following reaction
\[\mathrm{MnO}_{4}^{-}+8 \mathrm{H}^{+}+5 \mathrm{e}^{-} \rightarrow \mathrm{Mn}^{+2}+4 \mathrm{H}_{2} \mathrm{O}, \mathrm{E}^{\mathrm{o}}=1.51 \mathrm{~V}\]
The quantity of electricity required in Faraday to reduce five moles of \( \mathrm{MnO}_{4}^{-} \)is......
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Potassium chlorate is prepared by the electrolysis of \(\mathrm{KCl}\) in basic solution as:
\(6 \mathrm{OH}^{-}+\mathrm{Cl}^{-} \rightarrow \mathrm{ClO}_{3}^{-}+3 \mathrm{H}_{2} \mathrm{O}+6 \mathrm{e}^{-}\)
If only \(60 \%\) of the current is utilized in the reaction, the time (rounded off to the nearest hour) required to produce \(10 \mathrm{~g}\) of \(\mathrm{KClO}_{3}\) using a current of \(2 \mathrm{~A}\) is _____.
(Given: \(\mathrm{F}=96,500 \mathrm{C} \mathrm{mol}^{-1}\); molar mass of \(\mathrm{KClO}_{3}=122\) \(\mathrm{g} \mathrm{mol}^{-1}\) )
[JEE Main 2020, 6 Sep (Shift 1)]
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On electrolysis of dil sulphuric acid using Platinum electrode, the product obtained at anode will be \(:\)
[NEET 2020]
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Consider a \(70 \%\) efficient hydrogen-oxygen fuel cell working under standard conditions at 1 bar and \(298 \mathrm{~K}\). Its cell reaction is \(\mathrm{H}_{2}(\mathrm{~g})+\frac{1}{2} \mathrm{O}_{2}(\mathrm{~g}) \rightarrow \mathrm{H}_{2} \mathrm{O}(\mathrm{l})\)
The work derived from the cell on the consumption of \(1.0 \times 10^{-3} \mathrm{~mol}^{2}\) of \(\mathrm{H}_{2}(\mathrm{~g})\) is used to compress \(1.00 \mathrm{~mol}\) of a monoatomic ideal gas in a thermally insulated container. What is the change in the temperature (in K) of the ideal gas? The standard reduction potentials for the two half-cells are given below:
\(\mathrm{O}_{2}(\mathrm{~g})+4 \mathrm{H}^{+}(\mathrm{aq})+4 \mathrm{e}^{-} \rightarrow 2 \mathrm{H}_{2} \mathrm{O}(\mathrm{l}), \mathrm{E}^{\circ}=1.23 \mathrm{~V}\),
\(2 \mathrm{H}^{+}(\mathrm{aq})+2 \mathrm{e}^{-} \rightarrow \mathrm{H}_{2}(\mathrm{~g}), \mathrm{E}^{\circ}=0.00 \mathrm{~V}\).
Use \(\mathrm{F}=96500 \mathrm{~C} \mathrm{mol}^{-1}, \mathrm{R}=8.314 \mathrm{~J} \mathrm{~mol}^{-1} \mathrm{~K}^{-1}\). (Nearest integer)
[JEE Advanced 2020, Paper-1]
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At \(25^\circ \mathrm{C}\), the molar conductance at infinite dilution for the strong electrolytes \(\mathrm{NaOH},\mathrm{NaCl}\mathrm{and}{\mathrm{BaCl}}_{2}\mathrm{are}248\times {10}^{-4},126\times {10}^{-4}\mathrm{and}280\times {10}^{-4}{\mathrm{Sm}}^{2}{\mathrm{mol}}^{-1}\)respectively. \({∧}_{\mathrm{m}}^{∘}\mathrm{Ba}{\left(\mathrm{OH}\right)}_{2}\mathrm{in}{\mathrm{Sm}}^{2}{\mathrm{mol}}^{-1}\mathrm{is}\)
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Consider the cell at \(25^{\circ} \mathrm{C}\)
\(\mathrm{Zn} \mid \mathrm{Zn}^{2+}(\mathrm{aq}),(1 \mathrm{~M}) \| \mathrm{Fe}^{3+}(\mathrm{aq}), \mathrm{Fe}^{2+}\) (aq) | Pt(s)
The fraction of total iron present as \(\mathrm{Fe}^{3+}\) ion at the cell potential of \(1.500 \mathrm{~V}\) is \(x \times 10^{-2}\). The value of \(x\) is ____. (Nearest integer)
(Given: \({\mathrm{E}}_{{\mathrm{Fe}}^{3+}/{\mathrm{Fe}}^{2+}}^{\mathrm{o}}=0.77\mathrm{V},{\mathrm{E}}_{{\mathrm{zn}}^{2+}/\mathrm{Zn}}^{\mathrm{o}}=−0.76\mathrm{V},\)\(\sqrt{10}=3.16\))
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The resistivity of a \(0.8 \mathrm{~M}\) solution of an electrolyte is \(5 \times 10^{-3} \Omega \mathrm{cm}\). Its molar conductivity is ______\(\times 10^{4} \Omega^{-1}\) \(\mathrm{cm}^{2} \mathrm{~mol}^{-1}\). (Nearest integer)
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Statement I: The limiting molar conductivity of \({KCl}\) (strong electrolyte) is higher compared to that of \({CH}_3 COOH\) (weak electrolyte).
Statement II: Molar conductivity decreases with decrease in concentration of electrolyte.
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Match List-I with List-II.
| List-I (Parameter) | List-II (Unit) | ||
| (A) | Cell constant | (I) | \(\mathrm{S}{\mathrm{m}}^{2}{\mathrm{mol}}^{-1}\) |
| (B) | Molar conductivity | (II) | Dimensionless |
| (C) | Conductivity | (III) | \(\mathrm{m}^{-1}\) |
| (D) | Degree of dissociation of electrolyte | (IV) | \(\Omega^{-1} \mathrm{~m}^{-1}\) |
Choose the correct answer from the options given below:
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Statement I: The limiting molar conductivity of \({KCl}\) (strong electrolyte) is higher compared to that of \(CH_3 COOH\) (weak electrolyte)
Statement II: Molar conductivity decreases with decrease in concentration of electrolyte.
In the light of the above statements, choose the most appropriate answer from the options given below.
[JEE Main 2021, 26 Aug (Shift 1)]
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\( 250 \mathrm{~mL} \) of a waste solution obtained from the workshop of a goldsmith contains \( 0.1 \mathrm{~M} \mathrm{~AgNO}_{3} \) and \( 0.1 \mathrm{~M} \mathrm{~AuCl} \). The solution was electrolyzed at \( 2 \mathrm{~V} \) by passing a current of \( 1 \mathrm{~A} \) for 15 minutes. The metal/metals electrodeposited will be
\[ \left[\mathrm{E}_{\mathrm{Ag}^{*} / \mathrm{Ag}}^{0}=0.80 \mathrm{~V}, \mathrm{E}_{\mathrm{Au}^{*} / \mathrm{Au}}^{0}=1.69 \mathrm{~V}\right] \]
[JEE Main 2020, 4 Sep (Shift 2)]
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The equation that is incorrect is
[JEE Main 2020, 7 Jan (Shift 2)]
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Plotting \(1 / \Lambda_{\mathrm{m}}\) against \(\mathrm{c} \Lambda_{\mathrm{m}}\) for aqueous solutions of a monobasic weak acid (HX) resulted in a straight line with \(\mathrm{y}\)-axis intercept of \(\mathrm{P}\) and slope of \(\mathrm{S}\). The ratio \(\mathrm{P} / \mathrm{S}\) is
\(\left[\Lambda_{\mathrm{m}}=\right.\) molar conductivity
\(\Lambda_{\mathrm{m}}^{\circ}=\) limiting molar conductivity
\(\mathrm{c}=\) molar concentration
\(\mathrm{K}_{\mathrm{a}}=\) dissociation constant of HX]
[JEE Advanced 2023, Paper-1]
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The product obtained from the electrolytic oxidation of acidified sulphate solutions, is :
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Electrode potential data are given below:
\(F{e}^{+3}(aq)+{e}^{-}\to F{e}^{+2}(aq);E^\circ =+0.77V\) \(A{l}^{+3}(aq)+3{e}^{-}\to Al(s);E^\circ =-1.66V\) \(B{r}_{2}(aq)+2{e}^{-}\to 2B{r}^{-}(aq);E^\circ =+1.08V\)
Based on the data, the reducing power of \(F{e}^{+2}\), Al and \(B{r}^{-}\) will increase in the order
(PYQ-2023)
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At \(298 \mathrm{~K}\), the standard reduction potential for \(\mathrm{Cu}^{2+} / \mathrm{Cu}\) electrode is \(0.34 \mathrm{~V}\).
Given: \(\mathrm{K}_{\mathrm{sp}} \mathrm{Cu}(\mathrm{OH})_{2}=1 \times 10^{-20}\)
Take \(\frac{2.303 \mathrm{RT}}{\mathrm{F}}=0.059 \mathrm{~V}\)
The reduction potential at \(\mathrm{pH}=14\) for the above couple is \((-) \mathrm{x} \times 10^{-2} \mathrm{~V}\). The value of \(\mathrm{x}\) is _____.
[JEE Main 2023, 13 Apr (Shift 2)]
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Plotting 1/Λm against cΛm for aqueous solution of a monobasic weak acid (HX) resulted in a straight line with y-axis intercept of P and slope of S. The ratio P⁄S is
[Λm = molar conductivity
\({\Lambda }_{\mathrm{m}}^{^\circ }=\)limiting molar conductivity
c = molar concentration
Ka = dissociation constant of HX]
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For the disproportionation reaction \(2 \mathrm{Cu}^{+}(\mathrm{aq}) \rightleftharpoons \mathrm{Cu}(\mathrm{s})+\mathrm{Cu}^{2+}(\mathrm{aq})\) at \(298 \mathrm{~K}\), In \(\mathrm{K}\) (where \(\mathrm{K}\) is the equilibrium constant) is _____\(\times 10^{-1}\).
Given :
\(\left({\mathrm{E}}_{{\mathrm{Cu}}^{2+}/{\mathrm{Cu}}^{+}}^{\mathrm{o}}=0.16\mathrm{V},{\mathrm{E}}_{{\mathrm{Cu}}^{2+}/\mathrm{Cu}}^{\mathrm{o}}=0.52\mathrm{V},\frac{\mathrm{RT}}{\mathrm{F}}=0.025\right)\)
[JEE Main 2020, 2 Sep (Shift 2)]
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Given below are two statements
Statement-I: The limiting molar conductivity of \( \mathrm{KCl} \) (strong electrolyte) is higher as compared to that of \( \mathrm{CH}_{3} \mathrm{COOH} \) (weak electrolyte).
Statement-II: Molar conductivity decreases with decrease in concentration of electrolyte.
In the light of the above statements, choose the most appropriate answer from the options given below:
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An acidic solution of dichromate is electrolyzed for 8 minutes using \(2 \mathrm{~A}\) current. As per the following equation
\( \mathrm{Cr}_2 \mathrm{O}_7^{2-}+14 \mathrm{H}^{+}+6 \mathrm{e}^{-} \rightarrow 2 \mathrm{Cr}^{3+}+7 \mathrm{H}_2 \mathrm{O}\)
The amount of \(\mathrm{Cr}^{3+}\) obtained was 0.104 g. The efficiency of the process(in %) is ______. (Take : \(F=96000 \mathrm{~C}\), At. mass of chromium \(=52\) )
[JEE Main 2020, 3 Sep (Shift 2)]
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Given below are two statements :
\(1\) M aqueous solution of each of \(\mathrm{Cu}{\left({\mathrm{NO}}_{3}\right)}_{2}\), \({\mathrm{AgNO}}_{3},{\mathrm{Hg}}_{2}{\left({\mathrm{NO}}_{3}\right)}_{2},\mathrm{Mg}{\left({\mathrm{NO}}_{3}\right)}_{2}\) are electrolysed using inert electrodes
Given : \({\mathrm{E}}_{{\mathrm{Ag}}^{+}/\mathrm{Ag}}^{\theta }=0.80\mathrm{V},{\mathrm{E}}_{{\mathrm{Hg}}_{2}^{2+}/\mathrm{Hg}}^{\theta }=0.79\mathrm{V}\), \({\mathrm{E}}_{{\mathrm{Cu}}^{2+}/\mathrm{Cu}}^{\theta }=0.24\mathrm{V}\text{ and }{\mathrm{E}}_{{\mathrm{Mg}}^{2+}/\mathrm{Mg}}^{\theta }=-2.37\mathrm{V}\)
Statement (I) : With increasing voltage, the sequence of deposition of metals on the cathode will be Ag, Hg and Cu
Statement (II) : Magnesium will not be deposited at cathode instead oxygen gas will be evolved at the cathode.
In the light of the above statement, choose the most appropriate answer from the options given below
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The electrode potential of the following half cell at \(298 \mathrm{~K}\).
\(\mathrm{X}\left|\mathrm{X}^{2+}(0.001 \mathrm{M}) \| \mathrm{Y}^{2+}(0.01 \mathrm{M})\right| \mathrm{Y}\) is _______\(\times 10^{-2} \mathrm{~V}\) (Nearest integer).
Given: \(\begin{aligned} \mathrm{E}_{\mathrm{x}^{2+}{ }_{\mathrm{X}}}^0 & =-2.36 \mathrm{~V} \\ \mathrm{E}_{\mathrm{Y}^{2+} \mid \mathrm{Y}}^0 & =+0.36 \mathrm{~V}\end{aligned}\)
\(\frac{2.303 \mathrm{RT}}{\mathrm{F}}=0.06 \mathrm{~V}\)
[JEE Main 2023, 30 Jan (Shift 2)]
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For lead storage battery pick the correct statements
(A) During charging of battery, \(\mathrm{PbSO}_{4}\) on anode is converted into \(\mathrm{PbO}_{2}\)
(B) During charging of battery, \(\mathrm{PbSO}_{4}\) on cathode is converted into \(\mathrm{PbO}_{2}\)
(C) Lead storage battery, consists of grid of lead packed with \(\mathrm{PbO}_{2}\) as anode
(D) Lead storage battery has \(\sim 38 \%\) solution of sulphuric acid as an electrolyte
Choose the correct answer from the options given below
[JEE Main 2023, 12 Apr (Shift 1)]
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The resistance of a conductivity cell with cell constant \( 1.14 \mathrm{~cm}^{-1} \), containing \( 0.001 \mathrm{~M} \mathrm{~KCl} \) at \( 298 \mathrm{~K} \) is \( 1500 ~\Omega \). The molar conductivity of \( 0.001 \mathrm{~M} \mathrm{~KCl} \) solution at \( 298 \mathrm{~K}{\text { }} in \mathrm{~S} \mathrm{~cm}^{2} \mathrm{~mol}^{-1} \) is......
(Integer answer)
[JEE Main 2021, 27 Aug (Shift 2)]
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The specific conductance of \(0.0025 \mathrm{M}\) acetic acid is \(5 \times 10^{-5} \mathrm{~S} \mathrm{~cm}^{-1}\) at a certain temperature. The dissociation constant of acetic acid is ___ \(\times 10^{-7}\). (Nearest integer). Consider limiting molar conductivity of \(\mathrm{CH}_{3} \mathrm{COOH}\) as \(400 \mathrm{~S} \mathrm{~cm}^{2} \mathrm{~mol}^{-1}\)
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The standard electrode potential of \(\mathrm{M}^{+} / \mathrm{M}\) in aqueous solution does not depend on
[JEE Main 2023, 6 Apr (Shift 1)]
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Find electrode potential at pH = 5 for
2H₂O → O₂ + 4H⁺ + 4e⁻
E° = -1.23 V
[JEE Main 2020, 8 Jan (Shift 1)]
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At what \(\mathrm{pH}\), given half cell \(\mathrm{MnO}_{4}^{-}(0.1 \mathrm{~M}) \mid \mathrm{Mn}^{2+}(0.001 \mathrm{~M})\) will have electrode potential of \(1.282 \mathrm{~V}\) ?
(Nearest Integer)
Given: \(\mathrm{E}_{\mathrm{MnO}_{4}^{-} / \mathrm{Mn}^{2+}}^{\circ}=1.54 \mathrm{~V}, \frac{2.303 \mathrm{RT}}{\mathrm{F}}=0.059 \mathrm{~V}\)
[JEE Main 2023, 1 Feb (Shift 1)]
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An oxidation-reduction reaction in which 3 electrons are transferred has \(\Delta \mathrm{G}^{\circ}\) of \(17.37 \mathrm{~kJ} \mathrm{~mol}^{-1}\) at \(25^{\circ} \mathrm{C}\). The value of \(\mathrm{E}_{\text {cell }}^{0}\) (in \(\mathrm{V}\) ) is -------------\(\times 10^{-2}\). \(\left(1 \mathrm{~F}=96,500 \mathrm{~C} \mathrm{mol}^{-1}\right)\)
[JEE Main 2020, 5 Sep (Shift 1)]
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