For three different gases, values of van der Waal's constant 'a' and 'b' are given. What is the correct order of liquefaction of gases?
Gas '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 $Y_{2} > Z_{2} > X_{2}$
In van der Waal's equation, a is the correction term for attraction and higher the value of means higher are the forces of attraction so liquification of gases become easier.
so order of liquification is :
$Y_{2} > Z_{2} > X_{2}$

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