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Q.

A 0.2 molar solution of formic acid is 3.2% ionised. Its ionisation constant is

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a

9.6×10-3

b

2.048×10-4

c

1.25×10-6

d

4.8×10-5

answer is B.

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Detailed Solution

K=Cα2=0.2×(0.032)2=2.048×10-4
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