MHT CET 2022 Chemistry question

Identify the gases used to fill in electric bulbs?

(A)Ar and Correct
(B)He and
(C)He and
(D)Ne and He

Answer: (A)

Solution

Electric bulbs are filled with an inert, cheap and unreactive gas mixture, argon (about 86-93%) with a little nitrogen, so that the hot tungsten filament does not oxidise and evaporates slowly. Hence (A). Oxygen (B)

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Question ID VK-095907