Write the basic radicals and acidic radicals of the following and then write the chemical formulae of these compounds.

(a) Barium sulphate

(b) Bismuth nitrate

(c) Calcium bromide

(d) Ferrous sulphide

(e) Chromium sulphate

(f) Calcium silicate

(g) Stannic oxide

(h) Sodium zincate

(i) Magnesium phosphate

(j) Sodium thiosulphate

(k) Stannic phosphate

(l) Nickel bisulphate

(m) Potassium manganate

(n) Potassium ferrocyanide

Give the names of the elements and number of atoms of those elements, present in the following compounds.

(a) Sodium sulphate

(b) Quick lime

(c) Baking soda

(d) Ammonia

(e) Ammonium dichromate

Identify the cations (electropositive ions) and anions (electronegative ions) in the following compounds:

(a) CH₃COONa

(b) NH₄Cl

(c) PbCl₂

(d) MgO

Give an example of a divalent anion and a trivalent cation. Write the formula of the compound formed by their combination.