Question

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

Answer 1

because acid reacts with metal to form poisonous compounds along with h2 gas

Answer 2

HELLO DEAR FRIEND

HERE IS THE REASON BEHIND IT =>

Curd and other sour substances contain acids. When these substances are kept in brass and copper vessels, the acid reacts with metal and liberated hydrogen gas and other harmful substances which may spoil these substances.

HOPE IT HELPS YOU DEAR FRIEND THANKS