well buddy got that Cl and Ar one... we jz answered absent mindedly... c Cl exists in the form of molecules whereas Ar is monoatomic. and as we know vanderwaal forces don't make a big difference in cmparison to covalent bonds...so the boiling point of Cl2 is more....
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see i hav an answer 4 the fact that cl2 is more easily liquifiable than Ar see my explaination is similar to svj & goes like this .....
Ar having very weak intermolucular vander waals forces does not show large deviations from ideal behaviour at room tempareture indicating it has a low boyle tempareture . cl2 on the other hand has covalent bonds and other forces ..... making it have a very high boyle tempareture (tempareture at which ideal behaviour is obeyed over a series of pressure ) and so it shows large deviations from ideal behaviour more easily liquifiable gases have a high boyle tempareture . REASON 4 TIS - coz if i gas liquifies that means it is deviating from ideal behaviour as an ideal gas has no intermolecular forces it cant be liquified so only at high temparetures a gas like cl2 is at bound state and obeys ideal gas laws ok so at room temp u can easily liquify it .
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