P, Q, R and S are the different methods of preparation of salts.

P, Q, R and S are the different methods of preparation of salts.

P – Simple displacement
Q – Neutralisation by titration
R – Precipitation
S – Direct combination

Choose the most appropriate method to prepare the following salts:

(a) PbCl₂

(b) FeCl₃

(c) Na₂SO₄