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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?

BF₃, CH_4, and CCl₄ molecules: In BF₃, three are three BF bonds which are oriented at an angle of 120⁰ to one another. The three B-F bonds lie in one plane and cancel the dipole moment of one another. Hence, the dipole moment of BF₃ would be zero. Similarly, the dipole moments of methane (CH₄) and carbon tetrachloride (CCl₄) molecules would be zero due to their symmetrical tetrahedral shape.