MHT CET · Chemistry · p Block Elements (Group 15, 16, 17 & 18)

Which among the following oxoacids of phosphorus shows a tendency of disproportionation?

A Phosphinic acid $(H_{3} P O_{2})$
B Orthophosphoric acid $(H_{3} P O_{4})$
C Phosphonic acid $(H_{3} P O_{3})$
D Pyrophosphoric acid $(H_{4} P_{2} O_{7})$

Verified Solution

Answer & Solution

Correct Answer

(C) Phosphonic acid $(H_{3} P O_{3})$

Step-by-step Solution

Detailed explanation

4 H_{3} {PO}_{3} \to 3 H_{3} {PO}_{4} + {PH}_{3}

↓

(phosphonic acid)
in

H_{3} {PO}_{3}

the oxidation state is

+3

(Intermediate oxidation state) so it can under goes disproportionation reaction

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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