The experimentally determined N — F bond length in NF3 
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    The p-Block Elements

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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?

    Nitrogen and fluorine both are small and have high electron density, hence they repel the bonded pair of elctrons leading to larger bond than expected.
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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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