Question

Why should curd and sour substances not be kept in brass and copp
vessels?​

Answer 1

Answer:

Curd and sour substances contain acids. Acids react with metals to produce salt and hydrogen gas. So, if such substances are kept in copper container, the acid will react and the container will be corroded. So they are not kept in metal containers.

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Answer 2

Curd has lactic acid

A sour substance such as lemon has citric acid.  

We know acids react with active metals to give salt and hydrogen

Therefore when curd and sour substance are kept in brass and copper vessels they react with the elements forming respective salt and hydrogen. So we should not keep them in brass and copper vessels.

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