MHT CET · Chemistry · Chemistry in Everyday Life

Potassium metabisulphite is a(an)

A preservative
B antioxidant
C artificial sweetener
D Both (a) and (b)

Verified Solution

Answer & Solution

Correct Answer

(D) Both (a) and (b)

Step-by-step Solution

Detailed explanation

Potassium metabisulphite, \(\mathrm{K}_{2} \mathrm{~S}_{2} \mathrm{O}_{5}\), is a white crystalline solid with pungent odour of sulphur. It is used as an antimicrobial preservative, antioxidant and bleaching agent in food.

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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