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The most abundant rare gas in the atmosphere is ?

  • A.Ar
  • B.Ne
  • C.He
  • D.Xe

Answer: A

Argon is the most abundant noble gas in the atmosphere, at 0.93 per cent by volume.

Nearly all of it is argon-40, produced by the radioactive decay of potassium-40 in the crust. It is the third commonest gas in air, after nitrogen and oxygen.

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