Introduction to Redox and Oxidation Number 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

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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The oxidation states not shown by Mn in given reaction is:
$\mathrm{3MnO^{2-}_4+4H^+\rightarrow 2MnO^{-}_4+MnO_{2}+2H_2O}$
A. +6
B. +2
C. +4
D. +7
E. +3
Choose 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

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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.

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

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The correct structure of tribromo octoxide is:

1.
2.
3.
4.

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Disproportionation reactions are:

(a) $2 {Cu}^{+}$ $\to$ ${Cu}^{2 +} + {Cu}^{0}$

(b) $3 {MnO}_{4}^{2 -} + 4 H^{+}$ $\to$ $2 {MnO}_{4}^{-} + {MnO}_{2} + 2 H_{2} O$

(d) $2 {MnO}_{4}^{-} + 3 {Mn}^{2 +} + 2 H_{2} O$ $\to$ $5 {MnO}_{2} + 4 H^{\oplus}$

1. (a) and (d) only

2. (a) and (b) only

3. (a), (b) and (c)

4. (a), (c) and (d)

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Best description of the behavior of bromine in the reaction given below is:

$H_{2} O + {Br}_{2} \to HOBr + HBr$

1. Both oxidized and reduced

2. Oxidized only

3. Reduced only

4. Proton acceptor only

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A non-feasible reaction among the following is:

1. $2$ $KI + {Br}_{2} \to 2 KBr + I_{2}$

2. $2$ $KBr + I_{2} \to 2 KI + {Br}_{2}$

3. $2$ $KBr + {Cl}_{2} \to 2 KCl + {Br}_{2}$

4. $2 H_{2} O + 2 F_{2} \to 4 HF + O_{2}$

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