QAIPMT-2004-Ch-2583: NEET 2004 Chemistry - Class 11 AIPMT-2004-Ch-2583 Solution: \(H_2O\) is dipolar, whereas \(BeF_2\) is not. It is because

In H 2 O the central atom oxygen has two lone pairs of electrons and two bond pairs of electrons. Thus, the shape of H 2 O is bent or V-shape. Thus, the two dipoles of H-O bonds have some resultant value as they are not exactly in the opposite direction to cancel out each other. While in BeF 2 , there are two bond pairs on central atom Be, hence it is linear in shape. Thus, the two dipoles of bonds are exactly in opposite direction to each other and cancel each other to give net zero dipole moment.