Q.

Which one of the following is used as a food preservative?

A. Sodium benzoate
B. Sodium thiosulphate
C. Sodium hydroxide
D. Sodium bicarbonate
Answer» A. Sodium benzoate
Explanation: Sodium benzoate has the chemical formula. NaC6H5CO2, it is a widely used food preservative, with E number E211. It is the sodium salt of benzoic acid and exists in this form when dissolved in water. It can be produced by reacting sodium hydroxide with benzoic acid.
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