Question

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

Answer 1

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

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Curd and sour substances should not be kept in brass and copper vessels because these and other sour food-stuffs contain acids which can react with the metal of the vessel to form poisonous metal compounds which can cause food poisoning and affect our health adversely.

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Answer 2

Answer:

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Stars twinkle because … they're so far away from Earth that, even through large telescopes, they appear only as pinpoints. ... Planets shine more steadily because … they're closer to Earth and so appear not as pinpoints, but as tiny disks in our sky