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

Options

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)`

Answer

C

Explanation

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))`