When radioactive minerals like clevelte, monazite and pitchblende are heated to 1273 K in vacuum, the noble gas obtained is:
A
Rn
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B
Kr
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C
He
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D
Ne
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Solution
The correct option is BHe These radioactive minerals have entrapped He atoms, produced from α-particle, which they emit on heating in Vacuum. Thus the noble gas obtained on heating radioactive minerals is He.