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JEE Advanced2021Chemistryp Block Elements (Group 15, 16, 17 & 18)Actual

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

Options

  1. AUpon heating, H 3 PO 3 undergoes disproportionation reaction to produce H 3 PO 4 and PH 3 .
  2. BWhile H 3 PO 3 can act as reducing agent, H 3 PO 4 cannot.
  3. CH 3 PO 3 is a monobasic acid.
  4. DThe H atom of P - H bond in H 3 PO 3 is not ionizable in water.

Correct answer

A. Upon heating, H 3 PO 3 undergoes disproportionation reaction to produce H 3 PO 4 and PH 3 .

Step-by-step solution

4 H 3 PO 3 → ∆ 3 H 3 PO 4 + PH 3 (Disproportionation) Oxidation state of ' P ' in H 3 PO 4 is + 5 which is maximum oxidation state of ' P ' so H 3 PO 4 cannot act as a reducing agent whereas H 3 PO 3 can act as a reducing agent because the oxidation state is + 3 and it can increase upto + 5 . ⇒ H 3 PO 3 : It is dibasic acid. ⇒ Only H - atom attached with ' O ' is ionizable.

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