Recommended PYQs (STRICTLY NCERT Based) Redox Reactions Chemistry NEET Practice Questions, MCQs, Past Year Questions (PYQs), NCERT Questions, Question Bank, Class 11 and Class 12 Questions, and PDF solved with answers

Q1:

Which reaction is NOT a redox reaction?

1. $2 \mathrm{KClO}_3+\mathrm{I}_2 \rightarrow 2 \mathrm{KIO}_3+\mathrm{Cl}_2$
2. $\mathrm{H}_2+\mathrm{Cl}_2 \rightarrow 2 \mathrm{HCl}$
3. $\mathrm{BaCl}_2+\mathrm{Na}_2 \mathrm{SO}_4 \rightarrow \mathrm{BaSO}_4+2 \mathrm{NaCl}$
4. $\mathrm{Zn}+\mathrm{CuSO}_4 \rightarrow \mathrm{ZnSO}_4+\mathrm{Cu}$

Subtopic: Introduction to Redox and Oxidation Number |

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NEET - 2024

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Q2:

Which of the following reaction is not a disproportionation reaction?

1.	$2 \mathrm{~F}_{2(g)}+2 \mathrm{OH}_{(a q)}^{-} \rightarrow 2 \mathrm{~F}_{(a q)}^{-}+\mathrm{OF}_{2(g)}+\mathrm{H}_2 \mathrm{O}_{(l)}$
2.	$\mathrm{Cl}_{2(g)}+2 \mathrm{OH}^{-}_{(a q)} \rightarrow \mathrm{ClO}_{(a q)}^{-}+\mathrm{Cl}_{(a q)}^{-}+\mathrm{H}_2 \mathrm{O}_{(l)}$
3.	$2 \mathrm{NO}_{2(g)}+2 \mathrm{OH}^{-}_{(\mathrm{aq})} \rightarrow \mathrm{NO}_{2(\mathrm{aq})}^{-}+\mathrm{NO}_{3(\mathrm{aq})}^{-}+\mathrm{H}_2 \mathrm{O}_{(l)}$
4.	$2 \mathrm{H}_2 \mathrm{O}_{2(aq)} \rightarrow 2 \mathrm{H}_2 \mathrm{O}_{(l)}+\mathrm{O}_{2(g)}$

Subtopic: Redox Titration & Type of Redox |

58%

From NCERT

NEET - 2024

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Q3:

Given the following reaction involving manganese
($\text{Mn}$):$\mathrm{3MnO^{2-}_4+4H^+\rightarrow 2MnO^{-}_4+MnO_{2}+2H_2O}$

Which oxidation states of manganese are not observed in the above reaction?
A. +6
B. +2
C. +4
D. +7
E. +3
Mark the most appropriate answer from the options given below:
1. D and E only
2. B and D only
3. A and B only
4. B and E only

Subtopic: Introduction to Redox and Oxidation Number |

78%

From NCERT

NEET - 2024

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Q4:

For the given redox reaction,
$\mathrm{{a} {Cr}_2 {O}_7^{2-}+{bSO}_3^{2-}({aq})+{c} {H}^{+}({aq})} \rightarrow$
$\mathrm{2 {a} {Cr}^{3+}({aq})+{bSO}_4^{2-}({aq})+\frac{{c}}{2} {H}_2 {O}(\ell)} $
the coefficients a, b and c of a balanced equation are found to be, respectively:
1. 8, 1, 3
2. 1, 3, 8
3. 3, 8, 1
4. 1, 8, 3

Subtopic: Balancing of Equations |

75%

From NCERT

NEET - 2023

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Q5:

Identify the incorrect statement from the following:

1.	Lithium is the strongest reducing agent among the alkali metals.
2.	Alkali metals react with water to form their hydroxides.
3.	The oxidation number of K in KO₂ is +4.
4.	Ionisation enthalpy of alkali metals decreases from top to bottom in the group.

Subtopic: Introduction to Redox and Oxidation Number |

67%

From NCERT

NEET - 2022

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Q6:

At $298 \mathrm{~K},$ the standard electrode potentials of $\mathrm{Cu}^{2+} /\mathrm{Cu},$ $\mathrm{Zn}^{2+} / \mathrm{Zn},~~ \mathrm{Fe}^{2+} / \mathrm{Fe}$ and $\mathrm{Ag}^{+} / \mathrm{Ag} $ are $0.34 \mathrm{~V}, -0.76 \mathrm{~V},$ $-0.44 \mathrm{~V}$ and $0.80 \mathrm{~V},$ respectively.
On the basis of standard electrode potentials, predict which of the following reaction can not occur?

1.	$2 \mathrm{CuSO}_{4}(\mathrm{aq})+2 \mathrm{Ag}(\mathrm{s}) \rightarrow 2 \mathrm{Cu}(\mathrm{s})+\mathrm{Ag}_{2} \mathrm{SO}_{4}(\mathrm{aq}) $
2.	$\mathrm{CuSO}_{4}(\mathrm{aq})+\mathrm{Zn}(\mathrm{s}) $ $\rightarrow \mathrm{ZnSO}_{4}(\mathrm{aq})+\mathrm{Cu}(\mathrm{s}) $
3.	$\mathrm{CuSO}_{4}(\mathrm{aq})+\mathrm{Fe}(\mathrm{s}) $ $\rightarrow \mathrm{FeSO}_{4}(\mathrm{aq})+\mathrm{Cu}(\mathrm{s}) $
4.	$\mathrm{FeSO}_{4}(\mathrm{aq})+\mathrm{Zn}(\mathrm{s}) $ $\rightarrow \mathrm{ZnSO}_{4}(\mathrm{aq})+\mathrm{Fe}(\mathrm{s}) $

Subtopic: Emf & Electrode Potential |

69%

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NEET - 2022

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Q7:

A set of species capable of showing disproportionation reactions is:

1.	$\mathrm{ClO^–_2, ~ClO^–_3,~ ClO^–_4, ~Cl_2}$
2.	$\mathrm{Cl_2, ~ClO^–_2, ~ClO^–_3, ~S_8}$
3.	$\mathrm{ClO^–_4, ~ClO^–, ~ClO^–_2, ~F_2}$
4.	$\mathrm{ClO^–_3, ~ClO^–_4, ~H_2O_2, ~ClO^–}$

Subtopic: Redox Titration & Type of Redox |

61%

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NEET - 2022

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Q8:

Which of the following reactions is a decomposition redox reaction?

1.	$\mathrm{2 {~Pb}\left({NO}_3\right)_2({s}) \rightarrow 2 {PbO}({s})+4 {NO}_2({g})+{O}_2({g})} $
2.	$\mathrm{{N}_2({g})+{O}_2({g}) \rightarrow 2 {NO}({g})} $
3.	$\mathrm{{Cl}_2({g})+2 {OH}^{-}({aq}) \rightarrow {ClO}^{-}({aq})+{Cl}^{-}({aq})+4 {H}_2 {O}(\ell)}$
4.	$\mathrm{{P}_4({s})+3 {OH}^{-}({aq})+3 {H}_2 {O}(\ell) \rightarrow{PH}_3({g})+3 {H}_2 {PO}_2^{-}({aq})}$

Subtopic: Redox Titration & Type of Redox |

71%

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NEET - 2022

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Q9:

The correct example of metal displacement reaction among the following is:

1. $Fe + 2 HCl \to {FeCl}_{2} + H_{2} ↑$

2. $2 Pb {({NO}_{3})}_{2} \to 2 PbO + 4 {NO}_{2} + O_{2} ↑$

3. $2 {KClO}_{3} \overset{∆}{\to} 2 KCl + 3 O_{2}$

4. ${Cr}_{2} O_{3} + 2 Al \overset{∆}{\to} {Al}_{2} O_{3} + 2 Cr$

Subtopic: Introduction to Redox and Oxidation Number |

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NEET - 2021

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Q10:

What is the alteration in the oxidation state of carbon in the given reaction?

$\mathrm{{CH_4}_{(g)} + 4{Cl_2}_{(g)} \rightarrow {CCl_4}_{(l)} + 4 HCl_{(g)}}$

1.	0 to +4	2.	–4 to +4
3.	0 to –4	4.	+4 to +4

Subtopic: Oxidizing & Reducing Agents |

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NEET - 2020

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1.	\(2 \mathrm{~F}_{2(g)}+2 \mathrm{OH}_{(a q)}^{-} \rightarrow 2 \mathrm{~F}_{(a q)}^{-}+\mathrm{OF}_{2(g)}+\mathrm{H}_2 \mathrm{O}_{(l)}\)
2.	\(\mathrm{Cl}_{2(g)}+2 \mathrm{OH}^{-}_{(a q)} \rightarrow \mathrm{ClO}_{(a q)}^{-}+\mathrm{Cl}_{(a q)}^{-}+\mathrm{H}_2 \mathrm{O}_{(l)}\)
3.	\(2 \mathrm{NO}_{2(g)}+2 \mathrm{OH}^{-}_{(\mathrm{aq})} \rightarrow \mathrm{NO}_{2(\mathrm{aq})}^{-}+\mathrm{NO}_{3(\mathrm{aq})}^{-}+\mathrm{H}_2 \mathrm{O}_{(l)}\)
4.	\(2 \mathrm{H}_2 \mathrm{O}_{2(aq)} \rightarrow 2 \mathrm{H}_2 \mathrm{O}_{(l)}+\mathrm{O}_{2(g)}\)

1.	\(2 \mathrm{CuSO}_{4}(\mathrm{aq})+2 \mathrm{Ag}(\mathrm{s}) \rightarrow 2 \mathrm{Cu}(\mathrm{s})+\mathrm{Ag}_{2} \mathrm{SO}_{4}(\mathrm{aq}) \)
2.	\(\mathrm{CuSO}_{4}(\mathrm{aq})+\mathrm{Zn}(\mathrm{s}) \) \(\rightarrow \mathrm{ZnSO}_{4}(\mathrm{aq})+\mathrm{Cu}(\mathrm{s}) \)
3.	\(\mathrm{CuSO}_{4}(\mathrm{aq})+\mathrm{Fe}(\mathrm{s}) \) \(\rightarrow \mathrm{FeSO}_{4}(\mathrm{aq})+\mathrm{Cu}(\mathrm{s}) \)
4.	\(\mathrm{FeSO}_{4}(\mathrm{aq})+\mathrm{Zn}(\mathrm{s}) \) \(\rightarrow \mathrm{ZnSO}_{4}(\mathrm{aq})+\mathrm{Fe}(\mathrm{s}) \)

1.	\(\mathrm{ClO^–_2, ~ClO^–_3,~ ClO^–_4, ~Cl_2}\)
2.	\(\mathrm{Cl_2, ~ClO^–_2, ~ClO^–_3, ~S_8}\)
3.	\(\mathrm{ClO^–_4, ~ClO^–, ~ClO^–_2, ~F_2}\)
4.	\(\mathrm{ClO^–_3, ~ClO^–_4, ~H_2O_2, ~ClO^–}\)

1.	\(\mathrm{2 {~Pb}\left({NO}_3\right)_2({s}) \rightarrow 2 {PbO}({s})+4 {NO}_2({g})+{O}_2({g})} \)
2.	\(\mathrm{{N}_2({g})+{O}_2({g}) \rightarrow 2 {NO}({g})} \)
3.	\(\mathrm{{Cl}_2({g})+2 {OH}^{-}({aq}) \rightarrow {ClO}^{-}({aq})+{Cl}^{-}({aq})+4 {H}_2 {O}(\ell)}\)
4.	\(\mathrm{{P}_4({s})+3 {OH}^{-}({aq})+3 {H}_2 {O}(\ell) \rightarrow{PH}_3({g})+3 {H}_2 {PO}_2^{-}({aq})}\)

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