Important Redox Reactions Questions from NEET Previous Papers

Q 11 :
For the redox reaction,

${MnO}_{4}^{-} + C_{2} O_{4}^{2 -} + H^{+} ⟶ {Mn}^{2 +} + {CO}_{2} + H_{2} O$

The correct coefficients of the reactants for the balanced equation are: [2018]

${MnO}_{4}^{-} - 16,$ $C_{2} O_{4}^{2 -} - 5,$ $H^{+} - 2$
${MnO}_{4}^{-} - 2,$ $C_{2} O_{4}^{2 -} - 5,$ $H^{+} - 16$
${MnO}_{4}^{-} - 2,$ $C_{2} O_{4}^{2 -} - 16,$ $H^{+} - 5$
${MnO}_{4}^{-} - 5,$ $C_{2} O_{4}^{2 -} - 16,$ $H^{+} - 2$

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(2)

The correct balanced equation is

$2 {MnO}_{4}^{-} + 5 C_{2} O_{4}^{2 -} + 16 H^{+} \to 2 {Mn}^{2 +} + 10 {CO}_{2} + 8 H_{2} O$

Q 12 :
Hot concentrated sulphuric acid is a moderately strong oxidizing agent. Which of the following reactions does not show oxidizing behaviour? [2016]

$Cu + 2 H_{2} {SO}_{4} ⟶ {CuSO}_{4} + {SO}_{2} + 2 H_{2} O$
$S + 2 H_{2} {SO}_{4} ⟶ 3 {SO}_{2} + 2 H_{2} O$
$C + 2 H_{2} {SO}_{4} ⟶ {CO}_{2} + 2 {SO}_{2} + 2 H_{2} O$
${CaF}_{2} + H_{2} {SO}_{4} ⟶ {CaSO}_{4} + 2 HF$

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(4)

${CaF}_{2} + H_{2} {SO}_{4} \to {CaSO}_{4} + 2 HF$

Here, the oxidation state of every atom remains the same, so it is not a redox reaction.

Q 13 :
(I) $H_{2} O_{2} + O_{3} ⟶ H_{2} O + 2 O_{2}$

(II) $H_{2} O_{2} + {Ag}_{2} O ⟶ 2 Ag + H_{2} O + O_{2}$

Role of hydrogen peroxide in the above reactions is respectively [2014]

oxidizing in (I) and reducing in (II)
reducing in (I) and oxidizing in (II)
reducing in (I) and (II)
oxidizing in (I) and (II)

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(3)

[IMAGE 41]

[IMAGE 42]

$H_{2} O_{2}$ acts as reducing agent in both the reactions in which $O_{2}$ is evolved.

Q 14 :
The pair of compounds that can exist together is [2014]

${FeCl}_{3}, {SnCl}_{2}$
${HgCl}_{2}, {SnCl}_{2}$
${FeCl}_{2}, {SnCl}_{2}$
${FeCl}_{3}, KI$

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(3)

Both ${FeCl}_{2}$ and ${SnCl}_{2}$ are reducing agents with low oxidation numbers.

Topic Question Set

Q 11 :
For the redox reaction,

${MnO}_{4}^{-} + C_{2} O_{4}^{2 -} + H^{+} ⟶ {Mn}^{2 +} + {CO}_{2} + H_{2} O$

The correct coefficients of the reactants for the balanced equation are: [2018]

Q 12 :
Hot concentrated sulphuric acid is a moderately strong oxidizing agent. Which of the following reactions does not show oxidizing behaviour? [2016]

Q 13 :
(I) $H_{2} O_{2} + O_{3} ⟶ H_{2} O + 2 O_{2}$

(II) $H_{2} O_{2} + {Ag}_{2} O ⟶ 2 Ag + H_{2} O + O_{2}$

Role of hydrogen peroxide in the above reactions is respectively [2014]

Q 14 :
The pair of compounds that can exist together is [2014]

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Topic Question Set

Q 11 : For the redox reaction, MnO4-+C2O42-+H+⟶Mn2++CO2+H2O The correct coefficients of the reactants for the balanced equation are: [2018]

Q 12 : Hot concentrated sulphuric acid is a moderately strong oxidizing agent. Which of the following reactions does not show oxidizing behaviour? [2016]

Q 13 : (I) H2O2+O3⟶H2O+2O2 (II) H2O2+Ag2O⟶2Ag+H2O+O2 Role of hydrogen peroxide in the above reactions is respectively [2014]

Q 14 : The pair of compounds that can exist together is [2014]

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Q 11 :
For the redox reaction,

${MnO}_{4}^{-} + C_{2} O_{4}^{2 -} + H^{+} ⟶ {Mn}^{2 +} + {CO}_{2} + H_{2} O$

The correct coefficients of the reactants for the balanced equation are: [2018]

Q 12 :
Hot concentrated sulphuric acid is a moderately strong oxidizing agent. Which of the following reactions does not show oxidizing behaviour? [2016]

Q 13 :
(I) $H_{2} O_{2} + O_{3} ⟶ H_{2} O + 2 O_{2}$

(II) $H_{2} O_{2} + {Ag}_{2} O ⟶ 2 Ag + H_{2} O + O_{2}$

Role of hydrogen peroxide in the above reactions is respectively [2014]

Q 14 :
The pair of compounds that can exist together is [2014]