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pyrophosphoric acid

n.
1.a solid acid formed by reactions of orthophosphoric acid

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    Idiom of the Day

    come back
    to return to the place where you are now
    My cousin came back from her holidays last week.



    1.
    I pleaded with him with (a) / a view to conv.ncing him (b) / of my innocence in the matter. (c) / No error (d)

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