Q.

Minerals of radioactive origin such as pitchblende, monazite, cleveite are found to contain which of the noble gases?

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a

Helium and sometimes neon

b

Neon and sometimes helium

c

None of the above

d

Helium and sometimes Argon

answer is A.

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Detailed Solution

Helium is the noble gas that results from heating radioactive minerals like cleveite, monazite, and pitchblende to 1273 K in a vacuum. He atoms are trapped in these radioactive materials during alpha emission.

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