Weather balloons are filled with helium because:

lighter than air

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Less reactive

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Condenses at very low temperature

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Heavier than hydrogen

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Solution

The correct option is A lighter than air
Hydrogen and helium are very light gases and can be used to fill weather balloons. However, hydrogen is very inflammable and hence is dangerous to use in balloons. So, helium is preferred for this purpose.

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Food cans are coated with tin and not with zinc because

(a) zinc is costlier than tin.

(b) zinc has a higher melting point than tin.

(d) zinc is less reactive than tin.

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