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Give the disproportionation reaction of `H_(3)PO_(3)`.

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`H_(3)PO_(3)` undergoes disproportionation (self oxidation-reduction) on heating to form `PH_(3)` , in which P is reduced and `H_(3)PO_(4)` , in which P is oxidised.
`underset("Orthophosphorous acid")( 4H_(3)overset(+3)(P)O_(3))overset(Delta)tooverset(-3)(P)H_(3)+3H_(3)overset(+5)(P)O_(4)`
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CHHAYA PUBLICATION-P-BLOCK ELEMENTS-NCERT EXERCISE QUESTIONS
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  2. Why does nitrogen show catenation properties less than phosphorus?

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  3. Give the disproportionation reaction of H(3)PO(3).

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  4. Can PCl(5) act as an oxidising as well as a reducing agent? Justify.

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  9. Describe manufacture of H(2)SO(4) by contact process.

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  10. How is SO(2) an air pollutant?

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  11. Why are halogens strong oxidising agents?

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  12. Explain why fluorine forms only one oxoacid, HOF.

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  15. Why are halogens coloured?

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  16. Write the reactions of F(2) and Cl(2) with water.

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  19. What are the oxidation states of P in the following: H(3)PO(3)

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  20. What are the oxidation states of P in the following: PCl(3)

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