Helium is used in gas balloons instead of hydrogen because -

It is lighter than

H_{2}

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It is non-combustible

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It is more abundant than

H_{2}

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Its leakage can be detected easily

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Solution

The correct option is B It is non-combustible
Helium is used in gas balloons instead of hydrogen because it is a non combustible gas. 'He' doesn't catch fire like hydrogen because He is an inert gas.
Therefore, correct option is (b).

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