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

Among $H_2S$, $H_2O$, $NF_3$, $NH_3$ and $CHCl_3$, identify the molecule $(X)$ with the lowest dipole moment value. The number of lone pairs of electrons present on the central atom of the molecule $(X)$ is:

Which molecule has the maximum dipole moment $\mu$? (where $X = -NO_2$)

Which of the following is a polar compound?

Which of the following molecules is polar?

The standard molar enthalpy of vaporisation $(\Delta_{vap}H^{\circ})$ of $A, B$ and $C$ liquids is $23.3, 41$ and $29 \ kJ \ mol^{-1}$ respectively. The correct order of dipole-dipole attractive forces in these liquids is