BaCl2+H2SO4→BaSO4↓+2HCl. The reaction given above is an example of:
Displacement reaction
Combination reaction
Precipitation reaction
Decomposition reaction
In this reaction BaSO4 is obtained as a precipitate. Hence it is a precipitation reaction.
The reaction, Zn + 2HCl → ZnCl2 + H2 is an example of: