(a) Name a metal which is liquid at room temperature.
(b) Smoke and fod are aerosols. How do they differ from each other ?
(c ) Name an element which melts when kept on the palm.

Explanation

(a) Metal is mercury (Hg).
(b) In smoke, dispersed phase is a solid (dust or carbon particles). In aerosols, it is a liquid (water drops). Dispersion medium in both the cases is the same i.e. air.
(c ) It is either gallium (Ga) or cesium (Cs).