Redox Reactions
55 JEE Chemistry previous year questions on Redox Reactions — options free on every question; 6 include the answer & explanation free, the rest unlock with PYQ Pass.
Volume of M/8 \(KMn{O}_{4}\) solution required to react completely with 25.0 \(c{m}^{3}\) of M/4 \(FeS{O}_{4}\) in acidic medium is:
10.0 mL
The reaction is
\({\mathrm{MnO}}_{4}^{-}\) + 5Fe2+ + 8H+ → Mn2+ + 5Fe3+ + 4H₂O.
Using N₁V₁ = N₂V₂,
\(\frac{1}{8}\times 5{V}_{1}=\frac{1}{4}\times 25\)
Solving, V₁ = 10 mL.
Chlorine undergoes disproportionation in alkaline medium as shown below:
\({\mathrm{aCl}}_{2}(\mathrm{g})+{\mathrm{bOH}}^{−}(\mathrm{aq})\to {\mathrm{cClO}}^{−}(\mathrm{aq})+{\mathrm{dCl}}^{−}(\mathrm{aq})+{\mathrm{eH}}_{2}\mathrm{O}(\mathrm{l})\)
The values of a, b, c and d in a balanced redox reaction are respectively:
1, 2, 1 and 1
Balanced redox equation in alkaline medium:
Cl₂ + 2OH⁻ → ClO⁻ + Cl⁻ + H₂O
To balance:
Unbalanced form given in question:
aCl₂ + bOH⁻ → cClO⁻ + dCl⁻ + eH₂O
Balanced form:
a = 1, b = 2, c = 1, d = 1, e = 1
Hence, the correct option is: A (1, 2, 1, 1).
The lowest oxidation number of an atom in a compound \(A _2 B\) is -2 . The number of electrons in its valence shell is _____
6
\({A}_{2}B\to 2{A}^{+}+{B}^{−2},{B}^{−2}\) has complete octet in its dianionic form, thus in its atomic state it has 6 electrons in its valence shell. As it has negative charge, it has acquired two electrons to complete its octet.
Which of the following reaction(s) is/are correct?
(a) \(F{e}^{3+}+{I}^{-}⟶{I}_{2}+F{e}^{2+}\)
(b) \(F{e}^{3+}+{I}^{-}⟶Fe{I}_{3}\)
(c) \(F{e}^{2+}+{S}_{2}{O}_{8}^{2-}⟶Fe+2S{O}_{4}^{2-}\)
(d) \(F{e}^{2+}+{S}_{2}{O}_{8}^{2-}⟶F{e}^{3+}+2S{O}_{4}^{2-}\)
(a) and (d) only
-
(a) \(\mathrm{F}{\mathrm{e}}^{3+}\) oxidises \({\mathrm{I}}^{−}\) to \({\mathrm{I}}_{2}\) and itself gets reduced to \(\mathrm{F}{\mathrm{e}}^{2+}\) → correct redox reaction.
-
(b) \(\mathrm{F}\mathrm{e}{\mathrm{I}}_{3}\) is not stable in aqueous solution → incorrect.
-
(c) \(\mathrm{F}{\mathrm{e}}^{2+}\) cannot be reduced to Fe (0) by \({\mathrm{S}}_{2}{\mathrm{O}}_{8}^{2−}\) → incorrect.
-
(d) \({\mathrm{S}}_{2}{\mathrm{O}}_{8}^{2−}\) is a strong oxidant and oxidises \(\mathrm{F}{\mathrm{e}}^{2+}\) to \(\mathrm{F}{\mathrm{e}}^{3+}\) → correct.
Chlorine undergoes disproportionation in alkaline medium as shown below:
\({\mathrm{aCl}}_{2}(\mathrm{g})+{\mathrm{bOH}}^{−}(\mathrm{aq})\to {\mathrm{cClO}}^{−}(\mathrm{aq})+{\mathrm{dCl}}^{−}(\mathrm{aq})+{\mathrm{eH}}_{2}\mathrm{O}(\mathrm{l})\)
The values of a, b, c and d in a balanced redox reaction are respectively:
1, 2, 1 and 1
Balanced redox equation in alkaline medium:
Cl₂ + 2OH⁻ → ClO⁻ + Cl⁻ + H₂O
To balance:
Unbalanced form given in question:
aCl₂ + bOH⁻ → cClO⁻ + dCl⁻ + eH₂O
Balanced form:
a = 1, b = 2, c = 1, d = 1, e = 1
Hence, the correct option is: A (1, 2, 1, 1).
In acidic medium, \(K _2 Cr _2 O _7\) shows oxidising action as represented in the half reaction
\[Cr _2 O _7{ }^{2-}+ XH ^{+}+ Ye ^{\ominus} \rightarrow 2 A + ZH _2 O\]
\(X , Y , Z\) and \(A\) are respectively
[JEE Main 2024, 01 Feb (Shift 1)]
\(14,6,7\) and \(Cr ^{3+}\)
Given half-reaction in acidic medium:
Cr₂O₇²⁻ + XH⁺ + Ye⁻ → 2A + ZH₂O
We know standard reduction of dichromate in acidic medium:
Cr₂O₇²⁻ + 14H⁺ + 6e⁻ → 2Cr³⁺ + 7H₂O
Now comparing,
X = number of H⁺ = 14
Y = number of electrons = 6
Z = number of H₂O = 7
A = product formed = Cr³⁺
So values are:
X = 14, Y = 6, Z = 7, A = Cr³⁺
In acidic medium, \(K _2 Cr _2 O _7\) shows oxidising action as represented in the half reaction
\[Cr _2 O _7{ }^{2-}+ XH ^{+}+ Ye ^{\ominus} \rightarrow 2 A + ZH _2 O\]
\(X , Y , Z\) and \(A\) are respectively
[JEE Main 2024, 01 Feb (Shift 1)]
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Which of the following reaction(s) is/are correct?
(a) \(F{e}^{3+}+{I}^{-}⟶{I}_{2}+F{e}^{2+}\)
(b) \(F{e}^{3+}+{I}^{-}⟶Fe{I}_{3}\)
(c) \(F{e}^{2+}+{S}_{2}{O}_{8}^{2-}⟶Fe+2S{O}_{4}^{2-}\)
(d) \(F{e}^{2+}+{S}_{2}{O}_{8}^{2-}⟶F{e}^{3+}+2S{O}_{4}^{2-}\)
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Which of the following cannot function as an oxidising agent?
[JEE Main 2024, 27 Jan (Shift 2)]
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Which of the following cannot function as an oxidising agent?
[JEE Main 2024, 27 Jan (Shift 2)]
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Which of the following cannot function as an oxidising agent?
[JEE Main 2024, 27 Jan (Shift 2)]
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Thiosulphate reacts differently with iodine and bromine in the reaction given below:
\(2{\text{S}}_{2}{{\text{O}}_{3}}^{2−}+{\text{I}}_{2}\to {\text{S}}_{4}{{\text{O}}_{6}}^{2−}+2{\text{I}}^{−}\)
\({\text{S}}_{2}{{\text{O}}_{3}}^{2−}+5{\mathrm{Br}}_{2}+5{\text{H}}_{2}\text{O}\to 2{\mathrm{SO}}_{4}^{2−}+4{\mathrm{Br}}^{−}+10{\text{H}}^{+}\)
Which of the following statement justifies the above dual behaviour of thiosulphate?
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From the given list, the number of compounds with +4 oxidation state of Sulphur is ___________.
\({\mathrm{SO}}_{3},{\mathrm{H}}_{2}{\mathrm{SO}}_{3},{\mathrm{SOCl}}_{2},{\mathrm{SF}}_{4},{\mathrm{BaSO}}_{4},{\mathrm{H}}_{2}{\mathrm{S}}_{2}{\mathrm{O}}_{7}\)
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Volume of M/8 \(KMn{O}_{4}\) solution required to react completely with 25.0 \(c{m}^{3}\) of M/4 \(FeS{O}_{4}\) in acidic medium is:
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Which of the following cannot function as an oxidising agent?
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Which of the following cannot function as an oxidising agent?
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Given below are two statements:
Statement I: In the oxalic acid vs \(KMn{O}_{4}\) (in the presence of dil \({H}_{2}S{O}_{4}\) ) titration the solution needs to be heated initially to \(60^\circ C\), but no heating is required in Ferrous ammonium sulphate (FAS) vs \(KMn{O}_{4}\) titration (in the presence of dil \({H}_{2}S{O}_{4}\) )
Statement II: In oxalic acid vs \(KMn{O}_{4}\) titration, the initial formation of \(MnS{O}_{4}\) takes place at high temperature, which then acts as catalyst for further reaction. In the case of FAS vs \(KMn{O}_{4}\), heating oxidizes \(F{e}^{2+}\) into \(F{e}^{3+}\) by oxygen of air and error may be introduced in the experiment.
In the light of the above statements, choose the correct answer from the options given below
[JEE Main 2025, 28 Jan (Shift 1)]
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The species which does not undergo disproportionation reaction is
[JEE Main 2025, 22 Jan (Shift 2)]
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Which of the following does not show disproportionation reaction? (memory based jee mains shift-2 22/01/2025)
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Thiosulphate reacts differently with iodine and bromine in the reaction given below:
\(2{\text{S}}_{2}{{\text{O}}_{3}}^{2−}+{\text{I}}_{2}\to {\text{S}}_{4}{{\text{O}}_{6}}^{2−}+2{\text{I}}^{−}\)
\({\text{S}}_{2}{{\text{O}}_{3}}^{2−}+5{\mathrm{Br}}_{2}+5{\text{H}}_{2}\text{O}\to 2{\mathrm{SO}}_{4}^{2−}+4{\mathrm{Br}}^{−}+10{\text{H}}^{+}\)
Which of the following statement justifies the above dual behaviour of thiosulphate?
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Given below are two statements
Statement I: In the oxalic acid vs \(KMn{O}_{4}\) (in the presence of dil \({H}_{2}S{O}_{4}\) ) titration the solution needs to be heated initially to \(60^\circ C\), but no heating is required in Ferrous ammonium sulphate (FAS) vs \(KMn{O}_{4}\) titration (in the presence of dil \({H}_{2}S{O}_{4}\) )
Statement II: In oxalic acid vs \(KMn{O}_{4}\) titration, the initial formation of \(MnS{O}_{4}\) takes place at high temperature, which then acts as catalyst for further reaction. In the case of FAS vs \(KMn{O}_{4}\), heating oxidizes \(F{e}^{2+}\) into \(F{e}^{3+}\) by oxygen of air and error may be introduced in the experiment.
In the light of the above statements, choose the correct answer from the options given below.
[JEE Main 2025, 28 Jan (Shift 1)]
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Which reaction is NOT a redox reaction?
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Given below are two statements:
Statement I: In the oxalic acid vs \(KMn{O}_{4}\) (in the presence of dil \({H}_{2}S{O}_{4}\) ) titration the solution needs to be heated initially to \(60^\circ C\), but no heating is required in Ferrous ammonium sulphate (FAS) vs \(KMn{O}_{4}\) titration (in the presence of dil \({H}_{2}S{O}_{4}\) )
Statement II: In oxalic acid vs \(KMn{O}_{4}\) titration, the initial formation of \(MnS{O}_{4}\) takes place at high temperature, which then acts as catalyst for further reaction. In the case of FAS vs \(KMn{O}_{4}\), heating oxidizes \(F{e}^{2+}\) into \(F{e}^{3+}\) by oxygen of air and error may be introduced in the experiment.
In the light of the above statements, choose the correct answer from the options given below
[JEE Main 2025, 28 Jan (Shift 1)]
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The species which does not undergo disproportionation reaction is
[JEE Main 2025, 22 Jan (Shift 2)]
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Thiosulphate reacts differently with iodine and bromine in the reaction given below:
\(2{\text{S}}_{2}{{\text{O}}_{3}}^{2−}+{\text{I}}_{2}\to {\text{S}}_{4}{{\text{O}}_{6}}^{2−}+2{\text{I}}^{−}\)
\({\text{S}}_{2}{{\text{O}}_{3}}^{2−}+5{\mathrm{Br}}_{2}+5{\text{H}}_{2}\text{O}\to 2{\mathrm{SO}}_{4}^{2−}+4{\mathrm{Br}}^{−}+10{\text{H}}^{+}\)
Which of the following statement justifies the above dual behaviour of thiosulphate?
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Chlorine undergoes disproportionation in alkaline medium as shown below
\(\mathrm{a}{\mathrm{Cl}}_{2}(\mathrm{g})+\mathrm{b}{\mathrm{OH}}^{-}(\mathrm{aq})\to \mathrm{c}{\mathrm{ClO}}_{3}^{−}(\mathrm{aq})+\mathrm{d}{\mathrm{Cl}}^{-}(\mathrm{aq})+\mathrm{e}{\mathrm{H}}_{2}\mathrm{O}(\mathrm{l})\)
The values of \(a, b, c\) and \(d\) in a balanced redox reaction are respectively
[JEE Main 2024, 29 Jan (Shift 1)]
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Given below are two statements:
Statement I: In the oxalic acid vs \(KMn{O}_{4}\) (in the presence of dil \({H}_{2}S{O}_{4}\) ) titration the solution needs to be heated initially to \(60^\circ C\), but no heating is required in Ferrous ammonium sulphate (FAS) vs \(KMn{O}_{4}\) titration (in the presence of dil \({H}_{2}S{O}_{4}\) )
Statement II: In oxalic acid vs \(KMn{O}_{4}\) titration, the initial formation of \(MnS{O}_{4}\) takes place at high temperature, which then acts as catalyst for further reaction. In the case of FAS vs \(KMn{O}_{4}\), heating oxidizes \(F{e}^{2+}\) into \(F{e}^{3+}\) by oxygen of air and error may be introduced in the experiment.
In the light of the above statements, choose the correct answer from the options given below
[JEE Main 2025, 28 Jan (Shift 1)]
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In which one of the following sets all species show disproportionation reaction?
[JEE Main 2021, 31 Aug (Shift 2)]
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When 10 mL of an aqueous solution of \(F{e}^{2+}\) ions was titrated in the presence of dil. \({H}_{2}S{O}_{4}\) using diphenylamine indicator, 15 mL of 0.02 M solution of \({K}_{2}C{r}_{2}{O}_{7}\) was required to get the end point. The molarity of the solution containing \(F{e}^{2+}\) ions is \(x\times {10}^{-2}M\) . The value of x is____ (Nearest integer)
[JEE Main 2021, 25 Jul (Shift 1)]
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Which of the following equation depicts the oxidizing nature of \({\mathrm{H}}_{2}{\mathrm{O}}_{2}\) ?
[JEE Main 2021, 25 Feb (Shift 1)]
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The number of electrons involved in the reduction of permanganate to manganese dioxide in acidic medium is:
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Identify the process in which change in the oxidation state is five:
[JEE Main 2021, 25 Jul (Shift 2)]
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Which of the following options are correct for the reaction?
\[2\left[\mathrm{Au}\left(\mathrm{CN}\right)_2\right]^{-}(\mathrm{aq})+\mathrm{Zn}(\mathrm{s}) \rightarrow 2 \mathrm{Au}(\mathrm{s})+\left[\mathrm{Zn}(\mathrm{CN})_4\right]^{2-}(\mathrm{aq})\]
A. Redox reaction
B. Displacement reaction
C. Decomposition reaction
D. Combination reaction
Choose the correct answer from the options given below:
[JEE Main 2023, 6 Apr (Shift 1)]
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For the reaction: \({\mathrm{NH}}_{3}+{\mathrm{OCl}}^{−}\to {\mathrm{N}}_{2}{\mathrm{H}}_{4}+{\mathrm{Cl}}^{−}\)in basic medium, the
coefficients of \({\mathrm{NH}}_{3},{\mathrm{OCl}}^{−}\mathrm{and}{\mathrm{N}}_{2}{\mathrm{H}}_{4}\) for the balanced equation are
respectively
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Which of the following options are correct for the reaction
\[2\left[\mathrm{Au}\left(\mathrm{CN}\right)_2\right]^{-}(\mathrm{aq})+\mathrm{Zn}(\mathrm{s}) \rightarrow 2 \mathrm{Au}(\mathrm{s})+\left[\mathrm{Zn}(\mathrm{CN})_4\right]^{2-}(\mathrm{aq})\]
A. Redox reaction
B. Displacement reaction
C. Decomposition reaction
D. Combination reaction
Choose the correct answer from the options given below:
[JEE Main 2023, 6 Apr (Shift 1)]
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Given below are two statements
Statement-I: In redox titration, the indicators used are sensitive to change in pH of the solution.
Statement-II: In acid-base titration, the indicators used are sensitive to change in oxidation potential.
In the light of the above statements, choose the most appropriate answer from the options given below
[JEE Main 2023, 8 Apr (Shift 2)]
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Which of the following is not a disproportionation reaction?
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10.0 ml of 0.05 M KMnO4 solution was consumed in a titration with 10.0 mL of given oxalic acid dihydrate solution. The strength of given oxalic acid solution is ...... \(g/L\) (Round off to nearest integer)
[JEE Main 2021, 27 Jul (Shift 2)]
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0.4 g mixture of \(NaOH,N{a}_{2}C{O}_{3}\) and some inert impurities was first titrated with \(\frac{N}{10}HCl\) using phenolphthalein as an indicator, 17.5 mL of HCl was required at the end point. After this methyl orange was added and titrated. 1.5 mL of same HCl was required for the next end point. The weight percentage of \(N{a}_{2}C{O}_{3}\) in the mixture is (Rounded off to the nearest integer)
[JEE Main 2021, 25 Feb (Shift 1)]
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The species given below that does NOT show disproportionation reaction is:
[JEE Main 2021, 20 Jul (Shift 1)]
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20 mL of calcium hydroxide was consumed when it was reacted with 10 mL of unknown solution of \({H}_{2}S{O}_{4}\). Also 20 mL standard solution of 0.5 M HCl containing 2 drops of phenolphthalein was titrated with calcium hydroxide, the mixture showed pink colour when burette displayed the value of 35.5 mL whereas the burette showed 25.5 mL initially. The concentration of \({H}_{2}S{O}_{4}\) is ____ M (Nearest integer)
[JEE Main 2023, 13 Apr (Shift 1)]
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In basic medium \( \mathrm{CrO}_{4}^{2-} \) oxidises \( \mathrm{S}_{2} \mathrm{O}_{3}^{2-} \) to form \( \mathrm{SO}_{4}^{2-} \) and itself changes into \( \mathrm{Cr}(\mathrm{OH})_{4}^{-} \). The volume of \( 0.154 \mathrm{M} \mathrm{~CrO}_{4}^{2-} \) required to react with \( 40 \mathrm{~mL} \) of \( 0.25 \mathrm{M} \mathrm{~S}_{2} \mathrm{O}_{3}^{2-} \) is _______ \( \mathrm{mL} \).
(Rounded-off to the nearest integer)
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On balancing the given redox reaction,
\({\mathrm{aCr}}_{2}{\mathrm{O}}_{7}^{2-}+{\mathrm{bSO}}_{3}^{2-}(\mathrm{aq})+{\mathrm{cH}}^{+}(\mathrm{aq})\to \\ 2{\mathrm{aCr}}^{3+}(\mathrm{aq})+{\mathrm{bSO}}_{4}^{2-}(\mathrm{aq})+\frac{\mathrm{c}}{2}{\mathrm{H}}_{2}\mathrm{O}(ℓ)\)
the coefficients \(\mathrm{a}, \mathrm{b}\) and \(\mathrm{c}\) are found to be, respectively -
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The correct order of oxidation numbers of the metal ion in following oxides is:
(A) CrO3 (B) Fe2O3
(C) MnO2 (D) V2O5
(E) Cu2O
[JEE Main 2021, 25 Jul (Shift 1)]
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Given below are two statements :
Statement-I: Potassium hydrogen phthalate is a primary standard for standardisation of sodium hydroxide solution.
Statement-II: In this titration phenolphthalein can be used as indicator.
In the light of the above statements, choose the most appropriate answer from the options given below:
[01 Feb, 2024 (Shift-I)]
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The species given below that does not show disproportionation reaction is
[JEE Main 2021, 20 Jul (Shift 1)]
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A \( 20.0 \mathrm{~mL} \) solution containing \( 0.2 \mathrm{~g} \) impure \( \mathrm{H}_{2} \mathrm{O}_{2} \) reacts completely with \( 0.316 \mathrm{~g} \) of \( \mathrm{KMnO}_{4} \) in acid solution. The purity of \( \mathrm{H}_{2} \mathrm{O}_{2} \) (in %) is ...........
(mol. wt. of \( \mathrm{H}_{2} \mathrm{O}_{2}=34 \); mol. wt. of \( \mathrm{KMnO}_{4}=158 \) )
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In Chromyl chloride, the oxidation state of chromium is (+.......................)
[JEE Main 2023, 15 Apr (Shift 1)]
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Match List-I with List-II:
| List-I (Reaction) | List-II (Type of redox reaction) | ||
| (A) | N2(g)+O2(g) → 2NO(g) | (I) | Decomposition |
| (B) | 2Pb(NO3)2(s) → 2PbO(s) + 4NO2(g)+O2(g) | (II) | Displacement |
| (C) | 2Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g) | (III) | Disproportionation |
| (D) | 2 NO2(g)+2OH–(aq) → \({\mathrm{NO}}_{2}^{-}\)(aq) + \({\mathrm{NO}}_{3}^{-}\)(aq) + H2O(l) | (IV) | Combination |
Choose the correct answer from the options given below:
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Consider the following molecules: \({\mathrm{Br}}_{3}{\mathrm{O}}_{8},{\mathrm{F}}_{2}\mathrm{O},{\mathrm{H}}_{2}{\mathrm{S}}_{4}{\mathrm{O}}_{6}\text{, }\)\({\mathrm{H}}_{2}{\mathrm{S}}_{5}{\mathrm{O}}_{6}\text{ and }{\mathrm{C}}_{3}{\mathrm{O}}_{2}\) Count the number of atoms existing in their zero oxidation state in each molecule. Their sum is
[JEE Advanced 2023, Paper-2]
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The exact volumes of \(1\mathrm{M}\mathrm{NaOH}\) solution required to neutralize \(50\mathrm{mL}\text{of }1\mathrm{M}{\mathrm{H}}_{3}{\mathrm{PO}}_{3}\) solution and 100 mL of \(2\mathrm{M}{\mathrm{H}}_{3}{\mathrm{PO}}_{2}\), solution respectively, are
[JEE Main 2021, 16 Mar (Shift 2)]
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In basic medium, \({\mathrm{H}}_{2}{\mathrm{O}}_{2}\) exhibits which of the following reactions?
(A) \({\mathrm{Mn}}^{2+}⟶{\mathrm{Mn}}^{4+}\)
(B) \({\mathrm{I}}_{2}⟶{\mathrm{I}}^{-}\)
(C) \(\mathrm{PbS}⟶{\mathrm{PbSO}}_{4}\)
Choose the most appropriate answer from the options given below:
[JEE Main 2021, 18 Mar (Shift 2)]
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Given below are two statements:
Statement-I: S8 solid undergoes disproportionation reaction under alkaline conditions to form S2– and \({\mathrm{S}}_{2}{{\mathrm{O}}_{3}}^{2−}\)
Statement-II: \({\mathrm{ClO}}_{4}^{−}\) can undergo disproportionation reaction under acidic condition.
In the light of the above statements, choose the most appropriate answer from the options given below:
[JEE Main 2024, 31 Jan (Shift 2)]
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See the following chemical reaction:
\(C{r}_{2}{O}_{7}^{2-}+X{H}^{+}+6F{e}^{2+}\to YC{r}^{3+}\)\(+6F{e}^{3+}+Z{H}_{2}O\)
The sum of \(X, Y\) and \(Z\) is
[JEE Main 2023, 13 Apr (Shift 2)]
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The oxidation states of iron atoms in compounds (A), (B) and (C), respectively, are \(x, y\) and \(z\). The sum of \(x, y\) and \(z\) is, \(\mathrm{Na}_4\left[\mathrm{Fe}(\mathrm{CN})_5(\mathrm{NOS})\right]\) , \(\mathrm{Na}_4\left[\mathrm{FeO}_4\right]\) , \(\left[\mathrm{Fe}_2(\mathrm{CO})_9\right]\)
[JEE Main 2020, 2 Sep (Shift 1)]
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