Write the names of the following ions:

(a) HCO₃^-

(b) MnO₄^-

(c) N^3-

(d) Cr₂O₇^2-

Write the names of the compounds represented by the following formulae :

(a) K₂CO₃

(b) P₂O₅

(c) H₂S

(d) Ca(OH)₂

(e) CuSO₄

(f) SiO₂

Write the molecular formulae for the following compounds and name the elements present.

(a) Sodium bicarbonate

(b) Sodium chloride

(c) Sulphuric acid

(d) Nitric acid

The valency of aluminium is 3. Write the valency of other radicals present in the following compounds. Also name the compounds

(a) AlCl₃

(b) Al₂O₃

(c) AlN

(d) Al₂(SO₄)₃