Helium is preferred instead of hydrogen for filling balloons because it is:

Lighter than air

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Almost as light as hydrogen

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Non-combustible

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Inflammable

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Solution

The correct option is C
Non-combustible

Hydrogen is lighter, but it reacts explosively with oxygen. Helium is completely inert at normal conditions.

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Why is helium preferred instead of hydrogen to fill balloons?

The reason why balloons are filled with helium instead of hydrogen is:-

H_{2}

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