Indiscriminate disposal of used fluorescent electric lamps causes mercury pollution in the environment. Why is mercury used in the manufacture of these lamps?

When the lamp is switched on, it is the mercury which converts the ultraviolet energy into visible light

None of the statement given above is correct about the use of mercury in the manufacture of fluorescent lamps

A mercury coating on the inside of the lamp makes the light bright white

When the lamp is switched on, the mercury in the lamp causes the emission of ultraviolet radiations