The number of replaceable hydrogen in phosphorus acid is ________
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    The p-Block Elements
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    The basicity of phosphorus acid (H3PO3) is  _____________.

    Two

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    The number of replaceable hydrogen in phosphorus acid is ________.

    Two

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    In P4O10, the number of oxygen atoms bonded to each phosphorus atom is _________.

    Four

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    Ammonia is basic while phosphine is ___________ towards litmus.

    neutral

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    Dehydration of conc. nitric acid with P4O10 yields __________.

    Nitrogen pentoxide
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