Chlorine is non-polar molecule while HCl is polar covalent, Explain?

192.

Anionic bond is an extreme case of a polar covalent bond. Justify.

What causes the two atoms to combine to form a bond which is:
(i) Non-polar
(ii) Polar-covalent and
(iii) Ionic in nature?

Briefly explain the term 'Dipole moment'. How is it expressed and what are its units?

Although both CO₂ and H₂O are triatomic molecules, the shape of H₂O molecule is bent While that of CO₂ is linear. Explain this on the  basis of dipole moment. 

Explain why BeH₂ molecule has a zero dipole moment although the Be-H bonds are polar?

Carbon tetrachloride and ammonia have dipole moment values. Explain.

Both BF₃ and CH₄ have zero dipole moment. Explain.

Sketch the bond moments and resultant dipole moment in SO2, cis and trans forms of CH₂Cl₂.

The dipole moment of hydrogen halides decreases from HF to HI. Explain this trend.