Electrochemistry

Electrolysis of which compound give \({\mathrm{H}}_{2}{\mathrm{S}}_{2}{\mathrm{O}}_{8}\\\)
(Memory Based JEE Mains 22/01/2025,Shift -1)

Which of the following has least tendency to liberate \({H}_{2}\) from mineral acids?

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

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)]

Identify the factor from the following that does not affect electolytic conductance of a solution.

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)]

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)]

\({O}_{2}\) 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 :

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)]

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)]

Mass in grams of copper deposited by passing \(9.6487\mathrm{A}\) current through a voltmeter containing copper sulphate solution for \(100\) seconds is (Given : Molar mass of \(\mathrm{Cu}:63{\mathrm{gmol}}^{-1}\), \(1\mathrm{F}=96487\mathrm{C})\)

[NEET 2024]

From the following select the one which is not an example of corrosion?

[Re-NEET 2024]

How can an electrochemical cell be converted into an electrolytic cell

[JEE Main 2024, 6 Apr (Shift 2)]

Mass in grams of copper deposited by passing \(9.6487\mathrm{A}\) current through a voltmeter containing copper sulphate solution for \(100\) seconds is (Given : Molar mass of \(\mathrm{Cu}:63{\mathrm{gmol}}^{-1}\), \(1\mathrm{F}=96487\mathrm{C})\)

[NEET 2024]

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)]

What is the correct Nernst equation representation for the following cell reaction? (Memory based 29 Jan /2025 morning shift )

\(\mathrm{Mg}(\mathrm{s})\to {\mathrm{Mg}}^{2+}+2{\mathrm{e}}^{-}\\ {\mathrm{Ag}}^{+}+{\mathrm{e}}^{-}\to \mathrm{Ag}(\mathrm{s})\)

Identify the factor from the following that does not affect electrolytic conductance of a solution.

[JEE Main 2024, 31 Jan (Shift 1)]

Electrolysis of which compound give \({\mathrm{H}}_{2}{\mathrm{S}}_{2}{\mathrm{O}}_{8}\\\)
(Memory Based JEE Mains 22/01/2025,Shift -1)

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)]

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)]

The standard cell potential of the following cell

\(Zn|Z{n}^{{2}^{+}}(aq)||F{e}^{2+}(aq)∣Fe\)
is \(0.32 V\). Calculate the standard Gibbs energy change for the reaction:
\(Zn(s)+F{e}^{2+}(aq)\to Z{n}^{2+}(aq)+Fe(s)\)
(Given : \(1 F =96487 C\) )

[Re-NEET 2024]

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

\(A{g}^{+}+{e}^{-}\to Ag{E}^{\theta }=xV\)

\(F{e}^{2+}+2{e}^{-}\to Fe{E}^{\theta }=yV\)

\(F{e}^{3+}+3{e}^{-}\to Fe{E}^{\theta }=zV\)

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

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

Electrolysis of which compound give \({\mathrm{H}}_{2}{\mathrm{S}}_{2}{\mathrm{O}}_{8}\\\)
(Memory Based JEE Mains 22/01/2025,Shift -1)

Which of the following ions is the strongest oxidizing agent (Memory based 29 Jan /2025 morning shift )

\(\mathrm{Given}:{{\mathrm{E}}^{0}}_{{\mathrm{Al}}^{3+}/\mathrm{Al}}=-2.7\mathrm{V}\\ {{\mathrm{E}}^{0}}_{{\mathrm{Cu}}^{2+}/\mathrm{Cu}}=0.34\mathrm{V}\\ {{\mathrm{E}}^{0}}_{{\mathrm{Pb}}^{4+}/{\mathrm{Pb}}^{2+}}=1.8\mathrm{V}\\ {{\mathrm{E}}^{0}}_{{\mathrm{Ti}}^{3+}/\mathrm{Ti}}=-1.21\mathrm{V}\)

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:

\({\mathrm{E}}_{{\mathrm{Cr}}_{2}{\mathrm{O}}_{7}^{2-}/{\mathrm{Cr}}^{3+}}^{\mathrm{o}}=1.33\mathrm{V}{\mathrm{E}}_{{\mathrm{Cl}}_{2}/{\mathrm{Cl}}^{-}}^{\mathrm{o}}=1.36\mathrm{V}\\ {\mathrm{E}}_{{\mathrm{MnO}}_{4}^{-}/{\mathrm{Mn}}^{2+}}^{\mathrm{o}}=1.51\mathrm{V}{\mathrm{E}}_{{\mathrm{Cr}}^{3+}/\mathrm{Cr}}^{\mathrm{o}}=-0.74\mathrm{V}\)

Mark the strongest reducing agent.
(Memory Based JEE Mains 24/01/2025 ,Shift -2)

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)

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)]

\({\mathrm{Fe}}^{2+}+{\mathrm{Ag}}^{+}\to {\mathrm{Fe}}^{3+}+\mathrm{Ag};{\mathrm{E}}_{\mathrm{net}}^{\mathrm{o}}\mathrm{______}?\\ {\mathrm{Ag}}^{+}+{\mathrm{e}}^{-}\to \mathrm{Ag};{\mathrm{E}}^{\mathrm{o}}=\mathrm{x}\\ {\mathrm{Fe}}^{2+}+2{\mathrm{e}}^{-}\to \mathrm{Fe};{\mathrm{E}}^{\mathrm{o}}=\mathrm{y}\\ {\mathrm{Fe}}^{3+}+3{\mathrm{e}}^{-}\to \mathrm{Fe};{\mathrm{E}}^{\mathrm{o}}=\mathrm{z}\\ \mathrm{The}\mathrm{value}\mathrm{of}{\mathrm{E}}_{\mathrm{net}}^{\mathrm{o}}=?\)

(Memory Based 24/ 01/25 Shift-1 )

From the following select the one which is not an example of corrosion?

[Re-NEET 2024]

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)]

The best way to protect iron from rusting is—