1. Barrium chloride solution on treating with dilute sulphuric acid forms white ppt. of barium sulphate, which is insoluble in all acids
BaCl2 + H2SO4 (dil) → 2HCl + BaSO4 ↓
2. Lead nitrate on treating with dilute sulphuric acid forms white ppt of lead sulphate, which is insoluble in all acids.
Pb (NO3)2 + H2SO4 (dil) → 2HNO3 + PbSO4 ↓