MHT CET · Chemistry · Redox Reactions

Which of the following oxides can act both as oxidising agent as well as reducing agent?

A $N_{2} O$
B $S O_{2}$
C $S O_{3}$
D $P_{2} O_{5}$

Verified Solution

Answer & Solution

Correct Answer

(B) $S O_{2}$

Step-by-step Solution

Detailed explanation

S O_{2}

oxides can act both as an oxidising agent as well as reducing agent. It behaves as a reducing agent in most conditions. It convert iron (III) ions to iron (II) ions and decolourises acidified potassium permanganate (VII) solution.

2 F e^{3 +} S O_{2} + 2 H_{2} ⊙ \to 2 F e^{2 +} + S O_{4}^{2 -} + 4 H^{+}

When

S O_{2}

reacts with

H_{2} S,

it produces sulphur and water. In this reaction, ‘

S O_{2}

’ act as an oxidising agent.

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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