Question

The reaction between iron and copper sulphate solution represents which type of reaction ?
(1) decomposition
(2) combination
(3) single displacement
(4) double decomposition

Answer 1

As iron is more reactive than copper, so it will displace copper from copper sulphate solution and form iron sulphate.
$\mathrm{Fe}\left(\mathrm{s}\right)+{\mathrm{CuSO}}_4\left(\mathrm{aq}\right)\to {\mathrm{FeSO}}_4\left(\mathrm{aq}\right)+\mathrm{Cu}\left(\mathrm{s}\right)$
So, the following reaction is an example of a displacement reaction.

Hence, the correct answer is option 3.