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The p-Block Elements

Short Answer Type

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.

PH₃ has a lower boiling point than ammonia due to its inability to assorted via intermolecular hydrogn bonding. This is because phosphorus is bigger have bigger size as compare to nitrogen thus have weak bonding with hydrogen.

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