Question

In a double displacement reaction, are exchanged between the reactants.

• A. atoms
• B. ions
• C. compounds

Answer 1

The correct option is B ions

The reaction in which the reactants exchange their ions in order to form new products is called double displacement reaction.

Example: ${\text{Na}}_2{\text{SO}}_4\text{(aq)}+{\text{BaCl}}_2\text{(aq)}\to {\text{BaSO}}_4\text{(s)}+2\text{NaCl(aq)}$

In the given equation, sodium sulphate (${\text{Na}}_2{\text{SO}}_4$) and barium chloride (${\text{BaCl}}_2$) are exchanging their ions (both cations and anions) to form barium sulphate (${\text{BaSO}}_4$) and sodium chloride ($\text{NaCl}$).