Question

What is the difference between displacement and double displacement reactions? Write equations for these reactions.

Answer 1

In a displacement reaction , a more reactive element replaces a less reactive element from a compound.
A + BX $→$ AX + B, where A is more reactive than B.
For example: Displacement reaction: CuSO4(aq) + Zn(s) $→$ ZnSO4(aq) + Cu(s)

In a double displacement reaction , two atoms or a group of atoms switch places to form new compounds.
AB + CD $→$ AD + CB
For example: Double displacement reaction: Na2SO4(aq) + BaCl2(aq) $→$ BaSO4(s) + 2NaCl(aq)