(a) A is a sodium salt.
(b) B is an insoluble salt.
(c) C is a soluble salt of copper.
(d) D is a soluble salt of zinc.
Answers:
(a) Preparation – Neutralisation
Reaction Involved – NaOH + HCl → NaCl + H2O
(b) Preparation – Precipitation
Reaction Involved – Pb(NO3)2 + 2NaCl → PbCl2 + 2NaNO3
(c) Reaction Involved – CuCO3 + H2SO4→ CuSO4 + H2O + CO2
(d) Preparation – Simple displacement
Reaction Involved – Zn + H2SO4→ ZnSO4 + H2