Question
Draw neat labelled diagrams for two different experiments to prove that $–$ hydrogen is lighter than air.
✓
Answer
$(i)$ To show that $H_2$ is lighter than air :
$(ii)$ Air from jar $B$ being heavier runs down in jar $A$ and $H_2$ runs to jar $B$ as it is lighter than air and bums with ‘pop’ sound in jar $B$ if a burning splinter is brought there.
$(ii)$ Air from jar $B$ being heavier runs down in jar $A$ and $H_2$ runs to jar $B$ as it is lighter than air and bums with ‘pop’ sound in jar $B$ if a burning splinter is brought there.
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