Hydrogen gas can be collected into the test-tube by the downward displacement of water because it is __________ than air.

lighter

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heavier

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more polar

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less polar

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Solution

The correct option is B lighter
Hydrogen is having $1$ proton and ${1 e}^{-}$ , whereas air is mixture of molecules and componds, having mass greater than hydrogen. like $N_{2}, O_{2}, {C O}_{2}, A r,$ etc. Thus $H_{2}$ is lighter than air.

Hence, the correct option is $A$

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Similar questions

H_{2} O

Give reasons :

(a) Hydrogen is collected by the downward displacement of water and not of air, even though it is lighter than air.

(b) A candle brought near the mouth of a jar containing hydrogen gas starts burning but is extinguished when pushed inside the jar.

(d) Apparatus for laboratory preparation of hydrogen should be air tight and away from a naked flame.

P_{g a s}

= 13.6 g / c m^{3}]

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