Helium is obtained from which of the following?

Natural gases trapped under rock formations.

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Liquid air

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Radoactive decay

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Gasoline

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Solution

The correct options are
A Natural gases trapped under rock formations.
B Liquid air
D Radoactive decay
Helium is rare and costly.
Helium is separated by liquefying the other gases present in the natural gas. It is then either further purified or stored for later purification and use. Some helium is extracted directly from the atmosphere and radioactive decay.
Hence options A, B & C are correct.

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