Which of the following vessels cannot be used to store curd?

Plastic bowl

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Copper bowl

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Wooden bowl

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Plastic bag

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Solution

The correct option is B Copper bowl
Metals such as copper react with acids to form salts and hydrogen gas.

Lactic acid is present in curd. This acid reacts with metals like copper to form salts and hydrogen gas.

Hence, curd should not be stored in vessels made up of pure metals.

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