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Write the formula of the compound of pho...

Write the formula of the compound of phosphorus which is obtained when conc. `HNO_(3)` oxidises `P_(4)`.

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`{:(2HNO_(3)toH_(2)O+2NO_(2)+[O]xx10),(P_(4)+10[O]toP_(4)O_(10)),(P_(4)O_(10)+6H_(2)Oto4H_(3)PO_(4)):}/{:P_(4)+20HNO_(3)tounderset("Orthophosphoric acid")(4H_(3)PO_(4))+20NO_(2)+4H_(2)O:}`
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  14. Why does PCl(5) fume in moisture ?

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  20. Why does orthophosphoric acid exist as a syrupy liquid ?

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