Chemistry · Redox Reactions

NEET (UG) 2024 — Question 79

Which reaction is NOT a redox reaction?

Option A:
$\mathrm{Zn}+\mathrm{CuSO}_{4} \rightarrow \mathrm{ZnSO}_{4}+\mathrm{Cu}$
Option B:
$2 \mathrm{KClO}_{3}+\mathrm{I}_{2} \rightarrow 2 \mathrm{KIO}_{3}+\mathrm{Cl}_{2}$
Option C:
$\mathrm{H}_{2}+\mathrm{Cl}_{2} \rightarrow 2 \mathrm{HCl}$
Option D:
$\mathrm{BaCl}_{2}+\mathrm{Na}_{2} \mathrm{SO}_{4} \rightarrow \mathrm{BaSO}_{4}+2 \mathrm{NaCl}$
Correct

Answer: D

(1) $\mathrm{Zn}^0 + \mathrm{CuSO}_4 \longrightarrow \mathrm{ZnSO}_4 + \mathrm{Cu}^0$ , Redox reaction

(2) $\mathrm{KClO}_3 + \mathrm{I}_2^0 \longrightarrow 2\mathrm{KIO}_3 + \mathrm{Cl}_2^0$ , Redox reaction

(3) $\mathrm{H}_2^0 + \mathrm{Cl}_2^0 \longrightarrow 2\mathrm{HCl}^{-1}$ , Redox reaction

(4) $\mathrm{BaCl}_2^{-1} + \mathrm{Na}_2\mathrm{SO}_4^{-2} \longrightarrow \mathrm{BaSO}_4 + 2\mathrm{NaCl}^{-1}$

(D) This is not a redox reaction as there is no change in oxidation state.

Answer key and solution verified before publishing.

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