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a' and 'b' are van der Waals' constants ...

a' and 'b' are van der Waals' constants for gases Chlorine is more easily liquefied than ethane because .

A

a and b for `Cl_(2) lt a` and b for `C_(2)H_(6)`

B

a for `Cl_(2) lt a ` for `C_(2)H_(6)` but b for `Cl_(2) gt b` for `C_(2)H_(6)`

C

a for `Cl_(2) gt a` for `C_(2)H_(6)` but b for `Cl_(2) lt b` for `C_(2)H_(6)`

D

a and b for `Cl_(2) gt a` and b for `C_(2)H_(6)`

Text Solution

Verified by Experts

The correct Answer is:
C
a' is directly related to the intermolecular forces of attraction and hence to the ease of liquefaction of the gas and 'b' is a measure of the size of the molecules and hence inversely related to the ease of liquefaction. As `Cl_(2)` is more easily liquefied than `C_(2)H_(6)`, a for `Cl_(2) gt a` for `C_(2)H_(6)` but b for `Cl_(2) lt b` for `C_(6)H_(6)`.
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