TS EAMCET · Chemistry · Redox Reactions

Identify the pair of reactions undergoing disproportionation from the following.

A $2 H_{2} O_{2} \to 2 H_{2} O + O_{2}$ and ${Cl}_{2} + 2 NaOH \to NaCl + NaOCl + H_{2} O$
B $P_{4} + 3 NaOH + 3 H_{2} O \to {PH}_{3} + 3 {NaH}_{2} {PO}_{4}$ and ${Cl}_{2} + 2 NO \to 2 NaCl$
C ${Cl}_{2} + 2 KBr \to 2 KCl + {Br}_{2}$ and $5 {Cl}_{2} + I_{2} + 6 H_{2} O \to 2 {IO}_{3}^{-} + 10 {Cl}^{-} + 2 H^{+}$
D ${Pb}_{3} O_{4} + 8 HCl \to 3 {PbCl}_{2} + {Cl}_{2} + H_{2} O$ and $P_{4} + 3 NaOH \to 3 H_{2} O + {PH}_{3} + 3 {NaH}_{2} {PO}_{4}$

Verified Solution

Answer & Solution

Correct Answer

(A) $2 H_{2} O_{2} \to 2 H_{2} O + O_{2}$ and ${Cl}_{2} + 2 NaOH \to NaCl + NaOCl + H_{2} O$

Step-by-step Solution

Detailed explanation

Disproportionation Reaction: - Reaction in which an element is oxidised as well as reduced. (1) Cl20+OH-→Cl--1+Cl+1O-+H2O Since, there is both decrease and increase of oxidation states of chlorine, chlorine is undergoing oxidation as well as reduction. Therefore, it is a…

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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