JEE Mains · Chemistry · STD 11 - 7. Redox reactions

Given below are two statements : Statement \(I\): \(\mathrm{S}_8\) solid undergoes disproportionation reaction under alkaline conditions to form \(\mathrm{S}^{2-}\) and \(\mathrm{S}_2 \mathrm{O}_3{ }^{2-}\) Statement \(II\): \(\mathrm{ClO}_4^{-}\)can undergodisproportionation reaction under acidic condition. In the light of the above statements, choose the most appropriate answer from the options given below :

A Statement \(I\) is correct but statement \(II\) is incorrect.
B Statement \(I\) is incorrect but statement \(II\) is correct
C Both statement \(I\) and statement \(II\) are incorrect
D Both statement \(I\) and statement \(II\) are correct

Verified Solution

Answer & Solution

Correct Answer

(A) Statement \(I\) is correct but statement \(II\) is incorrect.

Step-by-step Solution

Detailed explanation

\(\mathrm{S}_1: \mathrm{S}_{\mathrm{8}}+12 \mathrm{OH}^{\ominus} \rightarrow 4 \mathrm{~S}^{2-}+2 \mathrm{~S}_2 \mathrm{O}_3^{2-}+6 \mathrm{H}_2 \mathrm{O}\) \(\mathrm{S}_2: \mathrm{ClO}_4^{\ominus}\) cannot undergo disproportionation reaction as chlorine is present in it's…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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From JEE Mains

List-I	List-II
(A) Mass density	(I) [ML²T^-3]
(B) Impulse	(II) [MLT^-1]
(C) Power	(III) [ML²T⁰]
(D) Moment of inertia	(IV) [ML^-3T⁰]

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