List- I List-ll
A) $H_{3} P O_{2}$ 1) Tribasic
B) $H_{3} P O_{3}$ 2) Mono basic
C) $H_{3} P O_{4}$ 3) Tetrabasic
D) $H_{4} P_{2} O_{6}$ 4) Di-basic

The correct match is :

A-3, B-2, C-1, D-5

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A-2, B-4, C-1, D-3

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A-2, B-5, C-3, D-4

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A-1, B-2, C-3, D-4

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Solution

The correct option is B A-2, B-4, C-1, D-3
The basicity of of oxoacids depends on those H atoms which are ionisable and attached with oxygen in P-OH form. Thus, $H_{3} P O_{2}, H_{3} P O_{3}, H_{3} P O_{2}$ and $H_{4} P_{2} O_{6}$ are monobasic, dibasic, tribasic and tetrabasic, respectively as the structure of these oxoacids have one, two, three and four $P - O H$ bonds.

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