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

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Ar, He

Ar, Xe

$Ar, Kr$

$Ar, Ne$

answer is B.

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Detailed Solution

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 $Kr$ .

In air there is almost $1 %$ by volume of noble gases

The order of abundance can be given as follows:

Ar > Rn > He > Xe

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