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411. Why does NH₃ act as a Lewis base?

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412. Why does NO₂ dimerise?

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413. What type of hybridisation is associated with N in NH_3,? What is the expected bond angle in NH₃?

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414. NO₂ is coloured but its dimer N₂O₄ is colourless. Why?

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415. Arrange the hydrides of group 15 in decreasing order of basic strength.

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416. Why ammonia is a good complexing agent?

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417. The experimentally determined N — F bond length in NF₃ is greater than the sum of the single bond covalent radii of N and F. Why?

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418. In what why it can be proved that PH₃ is basic in nature?

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419. Nitric acid (dilute or conc) renders aluminium passive. Why?

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420. Phosphine has a lower boiling point than ammonia. Give a reason.

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