State which type of chemical reactions proceed with -

(a) Evolution of heat energy

(b) Absorption of heat energy.

State in each of the following reactions whether heat is evolved or absorbed

(i) water is added to quicklime

(ii) two neutral gases on passage through an electric arc give nitric oxide

(iii) two neutral gases combine to give - a basic gas.

Certain thermal decomposition reactions, result in formation of oxides. Give balanced equations for the thermal decomposition of the following, which result in formation of a metallic oxide.

(a) Limestone

(b) Lead carbonate

(c) Calcium nitrate

(d) Calcium hydroxide.

Give two examples each of the following oxides -

(a) Acidic oxides

(b) Basic oxides

(c) Amphoteric oxides

(d) Neutral oxides.

State which of the following oxides i.e. (a) to (d) -

(i) React with water to give a base

(ii) React with a base to give salt & water

(iii) React with acids & bases to give salt & water.

Give one example each of -

(a) A peroxide

(b) A mixed oxide

(c) A dioxide.