AIIMS2003Chemistry-Acids and Bases
AIIMS 2003 Chemistry Acidity of Phosphorus Acids MCQ Question
Type: MCQ-conceptual-Medium-Class 12
The true statement for the acids of phosphorus, H₃PO₂, H₃PO₃ and H₃PO₄ is
A
the order of their acidity is H₃PO₄ > H₃PO₃ > H₃PO₂
B
all of them are reducing in nature
C
all of them are tribasic acids
D
the geometry of phosphorus is tetrahedral in all the three
Correct Answer
Option D
Detailed Explanation
H3PO2, H3PO3 and H3PO4 contain one, two and three ionisable hydrogen atoms respectively. H3PO2 ⇌ H+ + H2PO2- H3PO3 ⇌ H+ + HPO32- ⇌ 2H+ + HPO32- H3PO4 ⇌ H+ + H2PO4- ⇌ 2H+ + HPO42- ⇌ 3H+ + PO43- But there is very little difference in acidity.
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