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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.

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58. Write the electronic configuration of carbon atom in the excited state.

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59.

What is the percentage of s character in sp³ hybridised orbital?

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60. What type of hybridisation is present in BF₃ molecule?

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