A weak organic acid is :

1. Formic acid
2. Sulphuric acid
3. Nitric acid
4. Hydrochloric acid

A complex salt is :

1. Zinc sulphate
2. Sodium hydrogen sulphate
3. Iron [ammonium sulphate]
4. Tetraammine copper [II] sulphate

The basicity of acetic acid is:

1. 3
2. 1
3. 4
4. 2

Lead sulphate can be prepared by the following methods.

P Reacting lead with sulphuric acid.
Q Reacting lead nitrate with sodium sulphate solution.
R Reacting lead oxide with sodium sulphate solution.

(a) Only P
(b) Only Q
(c) Only R
(d) Both Q and R