'a' and 'b' are van der Waals constants for gases. Chlorine is more easily liquefied than ethane because :
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a and b for Cl2 > a and b for C2H6
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a and b for Cl2 < a and b for C2H6
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a and Cl2 < a for C2H6 but b for Cl2 > b for C2H6
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a for Cl2 > a for C2H6 but b for Cl2 < b for C2H6
