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Give the disproportionation reaction of `H_3PO_3`.

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`H_3PO_3` on heating undergoes self-oxidation reduction, i.e., disproportionation to form `PH_3` in which is reduced and `H_3PO_4` in which P is oxidised. Oxidation states of P in `H_3PO_3` , `PH_3 and H_3PO_4` are +3, -3 and +5, respectively.
`underset("Phosphorous acid ")overset(+3)(4H_3PO_3) overset(Delta)to underset("Phosphine")overset(-3)(PH_3) + underset("Orthophosphoric acid ") overset(+5)(3H_3PO_4)`
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U-LIKE SERIES-THE P-BLOCK ELEMENTS -NCERT TEXTBOOK EXERCISES
  1. Write main differences between the properties of white phosphorus and ...

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  2. Why does nitrogen show catenation properties less than phosphorus ?

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  3. Give the disproportionation reaction of H3PO3.

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  4. Can PCl5 act as an oxidising as well as a reducing agent ? Justify.

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  5. Justify the placement of O, S, Se, Te and Po in the same group of the ...

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  6. Why is dioxygen a gas but sulphur a solid ?

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  7. Knowing the electron gain enthalpy values for O to O^(-) and O to O^(2...

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  8. Which aerosols deplete ozone ?

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  9. Describe the manufacture of H2SO4 by contact process

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  10. How is SO2 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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  13. Explain why inspite of nearly the same electronegativity, oxygen forms...

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  14. Write two uses of ClO2 .

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  15. Why are halogens coloured ?

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  16. Write the reactions of F2 and Cl2 with water.

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  17. How can you prepare Cl2 from HCl and HCl from Cl2 ? Write reactions ...

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  18. What inspired N. Bartlett for carrying out reaction between Xe and PtF...

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  19. What are the oxidation states of phosphorous in the following : (i) ...

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  20. Write balanced equations for the following : NaCl is heated with sul...

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