On being slowly passed through water PH3 forms bubbles but N
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    The p-Block Elements

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

    N-H bond is more polar than P-H. NH3 dissolves in water due to its ability to form hydrogen bonds with water while PH3 can not form hydrogn bonds and is insoluble in water.
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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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    430. What is the difference between the nature of π -bonds present in H3PO3 and HNO3?
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