Question

* (i) Why should curd and other sour foods ,stuffs not to be kept in brass or copper vessels?
(ii) Dry HCl gas does not change the colour of dry blue litmus paper? Give reason;.

Answer 1

Dear student,

1. Curd should not be kept in copper vessels because curd contains lactic acid. Acid will react with the metallic vessel.

2.Dry HCl does not contain H⁺ ions . Aqueous solution will have H⁺ ions . Therefore there will be no change in litmus with dry HCl.

Regards