Question

Two different atoms or groups of atoms (ions) are exchanged in ________ reactions.

Answer 1

• A reaction in which two groups of atoms are displaced simultaneously is called a double displacement reaction.
• The generalised form of a double displacement reaction is $\mathrm{AB}+\mathrm{CD}\to \mathrm{AD}+\mathrm{BC}$.

For example, The well-known neutralisation reaction is a type of double displacement reaction.

$\mathrm{HCl}\left(\mathrm{l}\right)+\mathrm{NaOH}\left(\mathrm{aq}\right)\to \mathrm{NaCl}\left(\mathrm{s}\right)+{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)$

Therefore, two different atoms or groups of atoms (ions) are exchanged in double displacement reactions.