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PH 3 reacts with acids like HI to form PH 4 I which shows that it is basic in nature. PH 3 , + HI → PH 4 I Due to lone pair on phosphorus atom, PH 3 is acting as a Lewis base in the above reaction.

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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?

PH₃ reacts with acids like HI to form PH₄I which shows that it is basic in nature.
PH₃, + HI → PH₄I
Due to lone pair on phosphorus atom, PH₃ is acting as a Lewis base in the above reaction.

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