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Formic acid is 4.5% dissociated in 0.1 N...

Formic acid is 4.5% dissociated in 0.1 N solution at `20^@C`. The ionisation constant of formic add is

A

`21 xx 10^-6`

B

21

C

`0.21 xx 10^-4`

D

`2.1 xx 10^-4`

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