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Which of the following noble gas is not present in atmosphere?  (a) He (b) Ne (c) Ar  (d) Rn

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Which of the following noble gas is not present in atmosphere? 

(a) He

(b) Ne

(c) Ar 

(d) Rn

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1 Answer

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Correct option is (d) Rn

Radon is a radioactive element and is not present in the atmosphere. It is found in rocks containing uranium ores and is produced by the radioactive decay of radium.

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