Q.

The substance most commonly used as a food preservative is –

A. sodium carbonate
B. tartaric acid
C. acetic acid
D. sodium salt of benzoic acid
Answer» D. sodium salt of benzoic acid
Explanation: A preservative is a naturally occurring or synthetically produced substance that is added to products such as foods, pharmaceuticals, paints, biological samples, wood, etc. to prevent decomposition by microbial growth or by undesirable chemical changes. Preservative food additives can be used alone or in conjunction with other methods of food preservation. Preservatives may be antimicrobial preservatives, which inhibit the growth of bacteria or fungi, including mold or they can be antioxidants such as oxygen absorbers, which inhibit the oxidation of food constituents.
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