The density of aluminium is higher than mercury.
1. A body floats in liquid when the density of the body is less than the density of the liquid.
2. By experimental observations it has been seen that a body made of aluminium floats in mercury which indicates that the density of aluminium (2.7 g cm-3) is less than the density of mercury (13.6 g cm-3).
Hence, the given statement is false.