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AIIMS 2016
Exam
AIIMS
Year
2016
Subject
Chemistry
Chapter
p Block Elements (Group 15, 16, 17 & 18)

AIIMS 2016 · Chemistry · p Block Elements (Group 15, 16, 17 & 18)

The true statement for the acids of phosphorus, H_3 PO_2, H_3 PO_3...

The true statement for the acids of phosphorus, H3PO2,H3PO3\mathrm{H}_3 \mathrm{PO}_2, \mathrm{H}_3 \mathrm{PO}_3 and H3PO4\mathrm{H}_3 \mathrm{PO}_4 isThe true statement for the acids of phosphorus, H_3 PO_2, H_3 PO_3 and H_3 PO_4 is

Options

  1. Athe order of their acidity is H3PO4>H3PO3>H3PO2\mathrm{H}_3 \mathrm{PO}_4>\mathrm{H}_3 \mathrm{PO}_3>\mathrm{H}_3 \mathrm{PO}_2
  2. Ball of them are reducing in nature
  3. Call of them are tribasic acids
  4. Dthe geometry of phosphorus is tetrahedra in all the three.

Correct answer

D. the geometry of phosphorus is tetrahedra in all the three.

Step-by-step solution

H3PO2,H3PO3\mathrm{H}_3 \mathrm{PO}_2, \mathrm{H}_3 \mathrm{PO}_3 and H3PO4\mathrm{H}_3 \mathrm{PO}_4 contain one, two and three ionisable hydrogen atoms respectively. H3PO2⇌H++H2PO2−H3PO3⇌H++H2PO3−⇌H++HPO32−H3PO4⇌H++H2PO4−⇌H++HPO42−⇌H++PO43−\begin{aligned} & \mathrm{H}_3 \mathrm{PO}_2 \rightleftharpoons \mathrm{H}^{+}+\mathrm{H}_2 \mathrm{PO}_2^{-} \\ & \mathrm{H}_3 \mathrm{PO}_3 \rightleftharpoons \mathrm{H}^{+}+\mathrm{H}_2 \mathrm{PO}_3^{-} \rightleftharpoons \mathrm{H}^{+}+\mathrm{HPO}_3^{2-} \\ & \mathrm{H}_3 \mathrm{PO}_4 \rightleftharpoons \mathrm{H}^{+}+\mathrm{H}_2 \mathrm{PO}_4^{-} \rightleftharpoons \mathrm{H}^{+}+\mathrm{HPO}_4^{2-} \\ & \rightleftharpoons \mathrm{H}^{+}+\mathrm{PO}_4^{3-} \\ & \end{aligned} But there is very little difference in acidity. The true statement for the acids of phosphorus, H_3 PO_2, H_3 PO_3 and H_3 PO_4 is
As P\mathrm{P} is sp3s p^3 hybridised in all therefore all are tetrahedral.
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