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Q.

Which of the following element is not a gas?

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a

Hydrogen

b

Oxygen

c

Mercury

d

Nitrogen

answer is C.

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Detailed Solution

Mercury is a metal and a liquid at normal temperature, not a gas. At room temperature, there are 11 gases: hydrogen, nitrogen, oxygen, fluorine, chlorine, helium, neon, argon, krypton, xenon, and radon. 

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Which of the following element is not a gas?