Under similar conditions, in which of the following gases will the speed of sound be the least ?

Nitrogen

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Oxygen

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Carbon dioxide

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Sulphur dioxide

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Solution

The correct option is A Sulphur dioxide
Molecular masses of the given gases are ,
$M_{N} = 28$ ,
$M_{O} = 32$ ,
$M_{C O_{2}} = 44$ ,
$M_{S O_{2}} = 64$ ,
as molecular mass of sulphur dioxide is maximum therefore speed of sound in it will be least because speed is inversely proportional to molecular mass .

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