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

What is the highest oxidation state possessed by phosphorus in it's oxyacids?

A \(+6\)
B \(+4\)
C \(+3\)
D \(+5\)

Verified Solution

Answer & Solution

Correct Answer

(D) \(+5\)

Step-by-step Solution

Detailed explanation

\(+5\)
\(+5\) is the highest oxidation state possessed by phosphorus in it's oxyacids. In oxoacids phosphorus is tetrahedrally surrounded by other atoms. All these acid contains at least one \(\mathrm{P}=\) O bond and one \(\mathrm{P}-\mathrm{OH}\) bond. The oxoacids in which phosphorus has maximum oxidation state \((+5)\) is orthophosphoric \(\left(\mathrm{H}_{3} \mathrm{PO}_{4}\right)\), pyrophosphoric \(\left(\mathrm{H}_{4} \mathrm{P}_{2} \mathrm{O}_{7}\right)\) and metaphosphoric \(\left(\mathrm{HPO}_{3}\right)_{n}\).

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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