For three different gases values of Van der Waals' constant $^{'} a^{'}$ and $^{'} b^{'}$ are given. What is the correct order of liquefaction of gases?
Gases $a$ $b$
$X_{2}$ $1.3$ $0.090$
$Y_{2}$ $4.1$ $0.023$
$Z_{2}$ $2.2$ $0.075$

X_{2} > Y_{2} > Z_{2}

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Y_{2} > Z_{2} > X_{2}

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Z_{2} > Y_{2} > X_{2}

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X_{2} > Z_{2} > Y_{2}

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Solution

The correct option is B $Y_{2} > Z_{2} > X_{2}$
The higher is the value of van der Waals' constant ′a′, stronger are the intermolecular forces of attraction and greater is the ease of liquefaction.
The decreasing order of the ease of liquefaction is $Y_{2} > Z_{2} > X_{2}$ . It corresponds to the decreasing order of the value of van der Waals' constant ′a′ $Y_{2} (4.1) > Z_{2} (2.2) > X_{2} (1.3)$

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