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Van der Waal's Forces

'a' and 'b'...

Question

$^{'} a^{'}$ and $^{'} b^{'}$ are van deer Waals' constants for gases. Chlorine is more easily liquefied than ethane because

A

^{'} a^{'}

for

C l_{2} >^{'} a^{'}

for

C_{2} H_{6}

but

^{'} b^{'}

for

C l_{2} <^{'} b^{'}

for

C_{2} H_{6}

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B

^{'} a^{'}

and

^{'} b^{'}

for

C l_{2} >^{'} a^{'}

and

^{'} b^{'}

for

C_{2} H_{6}

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C

^{'} a^{'}

and

^{'} b^{'}

for

C l_{2} <^{'} a^{'}

and

^{'} b^{'}

for

C_{2} H_{6}

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D

^{'} a^{'}

for

C l_{2} <^{'} a^{'}

for

C_{2} H_{6}

but

^{'} b^{'}

for

C l_{2} >^{'} b^{'}

for

C_{2} H_{6}

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Solution

The correct option is A $^{'} a^{'}$ for $C l_{2} >^{'} a^{'}$ for $C_{2} H_{6}$ but $^{'} b^{'}$ for $C l_{2} <^{'} b^{'}$ for $C_{2} H_{6}$
$^{'} a^{'}$ for $C l_{2}$ will be greater than that of $C_{2} H_{6}$ because intermolecular force among the molecules of $C l_{2}$ hence the value of $^{'} b^{'}$ is also greater for $C_{2} H_{6}$ .

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