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AIIMS 2012
Exam
AIIMS
Year
2012
Subject
Chemistry
Chapter
p Block Elements (Group 15, 16, 17 & 18)

AIIMS 2012 · Chemistry · p Block Elements (Group 15, 16, 17 & 18)

Assertion : H_3 PO_2 has strong reducing property but H_3 PO_4 does...

Assertion : H3PO2\mathrm{H}_3 \mathrm{PO}_2 has strong reducing property but H3PO4\mathrm{H}_3 \mathrm{PO}_4 does not.Reason : P−OH\mathrm{P}-\mathrm{OH} bond present in H3PO4\mathrm{H}_3 \mathrm{PO}_4.Assertion : H_3 PO_2 has strong reducing property but H_3 PO_4 does not. Reason : P-OH bond present in H_3 PO_4 .Assertion : H_3 PO_2 has strong reducing property but H_3 PO_4 does not. Reason : P-OH bond present in H_3 PO_4 .

Options

  1. AIf both assertion and reason are true and reason is the correct explanation of assertion
  2. BIf both assertion and reason are true but reason is not the correct explanation of assertion
  3. CIf assertion is true but reason is false
  4. DIf both assertion and reason are false.

Correct answer

B. If both assertion and reason are true but reason is not the correct explanation of assertion

Step-by-step solution

Assertion : H_3 PO_2 has strong reducing property but H_3 PO_4 does not. Reason : P-OH bond present in H_3 PO_4 .
Assertion : H_3 PO_2 has strong reducing property but H_3 PO_4 does not. Reason : P-OH bond present in H_3 PO_4 .
Oxoacids of phosphorus which contain P−H\mathrm{P}-\mathrm{H} bond act as reducing agents and reduce metal salts to free metals. Thus, H3PO2\mathrm{H}_3 \mathrm{PO}_2 act as reducing agent while H3PO4\mathrm{H}_3 \mathrm{PO}_4 does not.
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