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Q.

Most and least abundant inert gases in atmosphere in terms of percentage by volume are respectively 

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a

Ar, Ne

b

Ar, Xe

c

Ar, He

d

Ar, Kr

answer is B.

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Detailed Solution

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  • Argon is the principle noble gas constituent of the air.
  • Xenon is the heaviest of the stable noble gases, with the elemental symbol Xe. It is also the least abundant in our atmosphere, being 10 times less common than Kr
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