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421. On being slowly passed through water PH₃ forms bubbles but NH₃ dissolves. Why is it so?

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422. Nitrogen does not form any pentahalides. Give reason.

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423. Phosphorus does not form P₂ molecular structure. Why?

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424. Why does PCl₃ fume in moisture?

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425. Are all the five bonds in PCl₅ molecule equivalent? Justify your answer.

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426. How do you account for the reducing behaviour of H₃ PO₂ on the basis of its structure?

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427. Why is H₃PO₃diprotic?

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428. What are flowers of phosphorus?

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429. H₂S is less acidic than H₂Te. Why?

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In H₃PO₃, there is p

π

– p

π

bond where as in HNO_3’ there is pπ-pπ bond, pπ-pπ bond in HNO₃ is stronger than pπ–dπ bond is H₃PO₄.

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