JEE Main · 2019 · 10 Apr 2019 · Shift 2 · p-Block Elements

The noble gas that does NOT occur in the atmosphere is:

(A)He
(B)Rn✓ Correct
(C)Ne
(D)Kr

Answer: (B)

Solution

Helium, neon and krypton all occur in the atmosphere as trace noble gases (of the order of

5

18

and

1

ppm by volume respectively). Radon is also a noble gas, but it is radioactive and is produced only continuously by the decay of radium in rocks and soil; owing to its short half-life it does not build up as a normal constituent of air. Radon is therefore the noble gas that does not occur in the atmosphere.

JEE Main · 2019 · 10 Apr 2019 · Shift 2 · Single correct option

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