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Chemical Bonding and Molecular Structure

Short Answer Type

51.

Out of H₂O and H₂S, which has the greatest bond angle?

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52.

The dipole moment of NH₃ is 1.49 D. Can you predict the shape?

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53. Explain why BeH₂ molecule has a zero dipolemoment although the Be-H bonds are polar.

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54. Can a non-polar molecule have polar covalent bonds? Give two examples.

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55.

The molecule of SO₂ has a dipole moment. Is the molecule linear or bent?

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56.

What is the dipole moment of BF₃ or CH₄ or CCl₄? What do you conclude from this value?

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57.
Arrange the bonds in order of increasing ionic character in the molecules:
LiF, K₂O, N₂, SO₂ and ClF₃.

Dipole moment helps in calculating the percentage ionic character of polar bonds. It is the ratio of observed dipole moment to the dipole moment for the complete transfer of electrons. Greater the difference in electronegativity of bonding atoms, the greater will be the ionic character.

On this basis, the order of increasing ionic character in the given molecules is,

N₂ < SO₂ < ClF₃ < K₂O < LiF

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