Write a balanced chemical equation for the preparation of each of the following salts:

(i) Copper carbonate

(ii) Ammonium sulphate crystals.

Give one word or a phrase for the statement :
The property by which certain hydrated salts, when left exposed to the atmosphere, lose their water of crystallization and crumble into powder.

Fill in the blank with the correct choice given in the bracket —
The salt prepared by the method of direct combination is …………… [iron [II] chloride / iron [III] chloride]

Three solutions P, Q, and R have pH value of 3.5, 5.2 and 12.2 respectively. State which one of these is a:

(i) weak acid

(ii) strong alkali