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S.No. Oxy acid S.No. Basicity
A) $H_{3} {PO}_{2}$ 1) Tribasic
B) $H_{3} {PO}_{3}$ 2) Mono basic
C) $H_{3} {PO}_{4}$ 3) Tetrabasic
D) $H_{4} P_{2} O_{6}$ 4) Dibasic
The correct match is

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

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

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

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

answer is B.

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Detailed Solution

$H_{3} P O_{2} - O n e P - O H, T w o P - H, O n e P = O$ ,

$H_{3} P O_{3} - t w o P - O H, o n e P - H, O n e P = O$

$H_{3} P O_{4} - t h r e e P - O H, O n e P = O$

$H_{4} P_{2} O_{6} - f o u r P - O H, o n e P - P, t w o P = O$

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