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Reaction of Metallic Oxides and Hydroxides with Acids

An element P ...

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.

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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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