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Ammonia

a and b are...

Question

$a$ and $b$ are Van der Waals constants for gases. Chlorine is more easily liquefied than ethane because:

a

and

b

for

C l_{2} > a

and

b

for

C_{2} H_{6}

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a

and

b

for

C l_{2} < a

and

b

for

C_{2} H_{6}

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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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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 C $a$ for $C l_{2}$ > $a$ for $C_{2} H_{6}$ but $b$ for $C l_{2}$ < $b$ for $C_{2} H_{6}$
Ease of liquefaction is proportional to $\frac{a}{b}$
For $C_{2} H_{6}$ , $a = 5.49$ , $b = 0.0638$
For $C l_{2}$ , $a = 6.49$ , $b = 0.0562$
Compressible gases have greater force of attraction and hence, value of ' $a$ ' should be greater and reduced volume ' $b$ ' should be less.

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Chlorine is more easily liquefied than ethane because ("a” and "b" are van der waals constants for gases).

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