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Q.

What is the main commercial source of helium?

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a

Atmospheric air

b

Coal gas

c

Natural gas

d

Water gas

answer is D.

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Detailed Solution

The primary commercial source of helium is natural gas, which typically includes 0.4% helium. In the diving equipment used by deep sea divers, a mixture of oxygen and helium is employed due to its poor solubility in blood.

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