Question

pickels and curd not store in copper utensils why​

Answer 1

Sour substances like pickles and curd are acidic in nature, i.e they have acids in them. So, when they are kept in brass or copper vessels, they react with them and form poisonous or better to say toxic elements which may prove harmful to for the human body. So, they are not kept in metal containers

Answer 2

because it contains acids which reacts with metals to form salt and hydrogen gas the salt is not good for our health if we by mistake eat the pickle stored in it then the pickle will contain the salt which will be harmful for our health and body. that is why pickles and curd are not stored in copper utensils