Question

Name a liquid in which a solid iron ball can float.

Answer 1

1. Objects having a density less than that of the liquid in which they are immersed, float on the surface of the liquid.
2. If the density of the object is more than the density of the liquid in which it is immersed then it sinks into the liquid.
3. The density of iron is less than the density of mercury so iron floats on mercury.

Hence, mercury is the correct answer.