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Question

An element P belongs to group 15. Its one of the allotrope is used in match box. It does not reacts with dil.H2SO4. It forms two oxides X and Y which turn blue litmus red. Identify P, X and Y. Write the reaction of P to form X and Y.


Solution

P= Phosphorus
Allotrope = red phosphorus 
  • X= H3PO4
    P4O10 + 6 H2O == 4 H3PO4

  • Y= H3PO3
    PCl3 + 3 H2O == H3PO3 + 3 HCl

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