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Introduction

The Van der w...

Question

The Van der waal's constant 'a' for gases $C H_{4}, N_{2}, N H_{3}$ and $O_{2}$ are 2.25, 1.39, 4.17 and 1.3 $L^{2} a t m m o l^{- 2}$ respectively. The gas which shows highest critical temperature is:

A

C H_{4}

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B

N_{2}

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C

N H_{3}

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D

O_{2}

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Solution

The correct option is B $N H_{3}$
The gas which shows the higher value of 'a' will have a higher value of critical temperature as Van der Waals constant 'a' is directly proportional to critical temperature i.e.,

$T_{C} = \frac{8 a}{27 R b}$

From given data, it can be seen that $N H_{3}$ has the highest value of 'a'.

Hence, the correct answer is option $C$ .

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Similar questions

Q. The value of van der Waal's constant '

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Q. The van der Waals' constant

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for different gases have been given as:

Gas	$a (a t m L^{2} m o l^{- 2})$
$O_{2}$	$1.36$
$N_{2}$	$1.39$
$C H_{4}$	$2.25$
$N H_{3}$	$4.17$

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1.36

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