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

Which of the following pairs of molecules will have a permanent dipole moment?

Consider the following:
Assertion $(A)$: Dipole moment of $NF_3$ is lesser than $NH_3$.
Reason $(R)$: In $NF_3$,the orbital dipole due to lone pair of electrons is in the opposite direction to the resultant dipole moment of the three $N-F$ bonds.
The correct answer is:

The dipole moment of $HCl$ is $1.03 \ D$. If the $H-Cl$ bond distance is $1.26 \ \mathring{A}$,what is the percentage of ionic character in the $H-Cl$ bond? ............. $\%$

Which of the following bonds is the most polar?

Which of the following compounds does not possess a dipole moment?