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In pure liquid of HCOOH, concentration o...

In pure liquid of `HCOOH`, concentration of `HCOO^(-)=10^(-3) M` at `27^(@)C`. What is the self- ionisation constant `(K=[HCOOH^(2+)][HCOO^(-)])`

A

`10^(-3)`

B

`10^(3)`

C

`10^(6)`

D

`10^(-6)`

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