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QJEEAdv21Ch9f92: JEE Advanced 2021 Chemistry - Class 12 JEEAdv21Ch9f92 Solution: The correct statement(s) related to oxoacids of phosphorous…

The correct statement(s) related to oxoacids of phosphorous is(are)

Multiple Choice Options

  • A Upon heating, H3PO3 undergoes disproportionation reaction to produce H3PO4 and PH3.
  • B While H3PO3 can act as reducing agent, H3PO4 cannot.
  • C H3PO3 is a monobasic acid.
  • D The H atom of P-H bond in H3PO3 is not ionizable in water.

Step-by-Step Verified Solution

(a) H3PO3 gives H3PO4 and PH3 on heating. This reaction is known as disproportionation reaction.

4H3PO3⟶Δ3H3PO4+PH3

(b) P in H3PO4 is in its highest oxidation state i.e. + 5 hence, it cannot act as reducing agent. But P in H3PO3 is in oxidation state, + 3 hence, it can act as reducing agent.

(c) H3PO3 contains two −OH groups, hence it is a dibasic acid.

JEE Advanced 2021 Paper 2 Online Chemistry - p-Block Elements Question 41 English Explanation
(d) Hydrogen attached to P, does not ionise in water. Therefore, options (a), (b) and (d) are correct.

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