Name the ions present in

(a) alumina

(b) fluorspar

(c) sulphuric acid

An element 'Y' is in II period and group 16 of the periodic table.

Answer the following questions:

(a) Is it a metal or a non-metal?

(b) Write the valence electrons present in the element Y.

(c) What is its valency?

An organic compound has an empirical formula (CH₂O). Its vapour density is 45. Then what will be the molecular formula of the compound?

State the conditions required for the following reactions.

(a) Conversion of ammonia to nitric oxide in presence of air.

(b) Conversion of hydrogen chloride to chlorine.

(c) Conversion of sodium bisulphate to sodium sulphate.