Why are metallic containers not used to store pickles that are sour in taste ?

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Solution

Curd and pickles contain lactic acid because it is sour in taste. We know that metals react with acids to form salts and hydrogen gas. When curd and other sour substances are kept in metallic containers like copper vessel, copper reacts with the acid in it to form hydrogen gas and toxic substances which are unhealthy and unfit for human consumption. It may cause food poisoning also.

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