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(D) The critical temperature of a gas is directly related to the strength of intermolecular forces of attraction. $H_2O$ is a polar molecule and posse

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possess a dipole moment.

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(D) The critical temperature of a gas is directly related to the strength of intermolecular forces of attraction. $H_2O$ is a polar molecule and possesses a permanent dipole moment,which leads to strong dipole-dipole interactions (hydrogen bonding). $O_2$ is a non-polar molecule and only exhibits weak London dispersion forces. Therefore,due to the presence of a dipole moment and stronger intermolecular forces,water has a higher critical temperature than $O_2$.

The critical temperature of water is higher than that of $O_2$ because $H_2O$ molecules ......

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Amongst $BeF_{2}$,$BF_{3}$,$H_{2}O$,$NH_{3}$,$CCl_{4}$ and $HCl$,the number of molecules with non-zero net dipole moment is ...... .

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