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

(a)

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

(b)

When the lamp is switched on, the mercury in the lamp causes the emission of ultra-violet radiations

(c)

When the lamp is switched on, it is the mercury which converts the ultra-violet energy into visible light

(d)

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

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