(D) Potassium metabisulphite,$K_{2}S_{2}O_{5}$,is a white crystalline solid with a pungent odour of sulphur.It is widely used in the food industry as

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(D) Potassium metabisulphite,$K_{2}S_{2}O_{5}$,is a white crystalline solid with a pungent odour of sulphur.It is widely used in the food industry as an antimicrobial preservative to prevent spoilage and as an antioxidant to prevent oxidation of food products.Therefore,it functions as both a preservative and an antioxidant.