Question

Given below are two statements:
Statement I: $\text{S}_8$ solid undergoes disproportionation reaction under alkaline conditions to form $\text{S}^{2-}$ and $\text{S}_2\text{O}_3^{2-}$.
Statement II: $\text{ClO}_4^-$ can undergo disproportionation 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

Answer 1

Answer: (A)

Statement I is correct but statement II is incorrect.

Answer 2

Statement I is correct because $S_8$ can indeed undergo disproportionation in alkaline medium:

$S_8 + 12 \text{OH}^- \rightarrow 4 S^{2-} + 2 S_2O_3^{2-} + 6 H_2O.$

Statement II is incorrect because $\text{ClO}_4^-$ cannot undergo disproportionation as chlorine is already in its highest oxidation state.