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Question

Helium is preferred over hydrogen for filling balloons because it is

A
lighter than air.
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B
almost as light hydrogen.
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C
non-combustible.
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D
inflammable.
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Solution

The correct option is C non-combustible.
Non-combustible
Hydrogen is highly combustible and even the slightest of spark can set it on fire. Hence, helium is preferred over hydrogen for filling balloons.

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