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H(3)PO(2) and H(3)PO(3) act as good redu...

`H_(3)PO_(2)` and `H_(3)PO_(3)` act as good reducing agents while `H_(3)PO_(4)` does not. Discuss.

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Both `H_(3)overset(+1)(PO_(2))` and `H_(3)overset(+3)(PO_(3))` can increase the oxidation state of phosphorus upto `+5`. They therefore, act as good reducing agents. However, in `H_(3)PO_(4)`, oxidation state of phosphorus is already `+5` (maximum possible oxidation state). It can act as on an oxidising agent and not as a reducing agent.
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DINESH PUBLICATION-THE P-BLOCK ELEMENTS -Concept Based Questions
  1. Why does nitric oxide become brown when released in air ?

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  2. There is a small increase in atomic radius in moving from P to As in g...

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  3. H(3)PO(2) and H(3)PO(3) act as good reducing agents while H(3)PO(4) do...

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  4. Give reasons for the following : (a) CN^(-) ion is known but CP^(-) ...

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  5. Explain why both N and Bi do not form pentahalides while phosphorus do...

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  6. MgN(2) when reacted with water gives NH(3) and HCl. However, MgCl(2) d...

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  7. A water soluble compound of a posisonous element M when heated with Zn...

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  8. (SiH(3)) is a weaker base than (CH(3))(3)N. Explain.

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  9. When conc. H(2)SO(4) was added to an unknown salt present in a test wh...

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  10. A colourless gas 'A' with a pungent odour is highly soluble in water a...

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  11. Zinc reacts with dilute H(2)SO(4) to give H(2). It also reacts with co...

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  12. H(2)S acts only as reducing agent while SO(2) can act both as a reduci...

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  13. Sulphur dioxide acts as bleaching agent in the presence of moisture. D...

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  14. Sulphur is a solid while oxygen is a gas at room temperature. Why ?

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  15. SF(6) is a well known compound while SH(6) does not exist. Explain.

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  16. Oxygen does not show oxidation states of +4 " and " +6 like sulphur. E...

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  17. H(2)O is liquid while H(2)S is a gas at room temperature. Explain.

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  18. Sulphur dioxide is a more powerful reducing agent in the alkaline medi...

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  19. Bond angle in H(2)S is lower than in H(2)O. Justify.

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  20. Hydrogen sulphide cannot be dried by passing through conc. H(2)SO(4) ....

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