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

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(1) \( a \) and \( b \) for \( \mathrm{Cl}_{2}a \) and \( b \) for \( \mathrm{C}_{2} \mathrm{H}_{6} \)
(2) \( a \) and \( b \) for \( \mathrm{Cl}_{2}a \) and \( b \) for \( \mathrm{C}_{2} \mathrm{H}_{6} \)
(3) \( a \) for \( \mathrm{Cl}_{2}a \) for \( \mathrm{C}_{2} \mathrm{H}_{6} \) but \( b \) for \( \mathrm{Cl}_{2}b \) for \( \mathrm{C}_{2} \mathrm{H}_{6} \)
(4) \( a \) for \( \mathrm{Cl}_{2}a \) for \( \mathrm{C}_{2} \mathrm{H}_{6} \) but \( b \) for \( \mathrm{Cl}_{2}b \) for \( \mathrm{C}_{2} \mathrm{H}_{6} \)
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