Question

why should curd and sour substances not be kept in brass and copper vessel ?​

Answer 1

Explanation:

Curd and sour substances should not be kept in copper vessels because they react with copper to form toxic compounds which may be unfit for human consumption also they may cause food poisoning.

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Answer 2

$<bullet> Curd and other sour substances contain acids. Therefore, when they are kept in brass and copper vessels, the metal reacts with the acid to liberate hydrogen gas and harmful products, thereby spoiling the food.$