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Formic acid is 4.6% dissociated in a 0.1...

Formic acid is `4.6%` dissociated in a 0.1 N solution at `20^@C` . The ionisation constant of formic acid is :

A

`21xx10^(-4)`

B

21

C

`0.21xx10^(-4)`

D

`2.1xx10^(-4)`

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The correct Answer is:
D
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