A reddish pink substance on heating gives off a vapour which condenses on the sides…
CHEMISTRY · Single correct · CBSE · Chemistry · Acids, Bases and Salts · Acids, Bases and Salts
Problem
A reddish pink substance on heating gives off a vapour which condenses on the sides of the test tube and the substance turns blue. It on cooling water is added to the residue it turns to its original colour. The substance is:
(1) Iodine crystals
(2) Copper sulphate crystals
(3) Cobalt chloride crystals
(4) Zinc oxide