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

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`

B

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

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The correct Answer is:
C
van der Waal's constant 'a' signifies the attractive forces among molecules of the real gas. More the value of 'a' more are the attractive forces `a(Cl_(2)) gt a(C_(2) H_(6))`
van der Waal's constant 'b' is a measure of effective size of gas molecule. it is four times the actual volume of the gas molecule `b (Cl_(2)) lt b (C_(2)H_(6))`
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