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Q.

To neutralise completely 20 mL of 0.1 M aqueous solution of phosphorous acid H3PO3, the volume of 0.1 M aqueous KOH solution required is

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a

40 mL

b

10 mL

c

60 mL

d

20 mL

answer is A.

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Detailed Solution

H3PO3 is a dibasic acid

N1V1 (acid) =N2V2 (base) 

0.1×2×20=0.1×1×V2 ∴V2=0.1×2×200.1×1=40ml

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