Of the following, the largest value of entropy at 25°C and 1 atm is that of:

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$H_{2}$

$C_{2} H_{6}$

$C_{2} H_{2}$

$C H_{4}$

answer is B.

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Detailed Solution

At a given temperature, Entropy is highest for a gas with highest molar mass. Entropy is an extensive property. It depends on the quantity of substance.
$∴$ Entropy at $25^{0} C$ and 1 atm is highest for $C_{2} H_{6}$

$C_{2} H_{6} > C_{2} H_{2} > C H_{4} > H_{2}$ .

Greater the atomicity of the gas ,greater the degrees of freedom hence higher the entropy

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