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0.2 molar solution of formic acid is ion...

0.2 molar solution of formic acid is ionized to 3.2 %. Its ionisation constant is :

A

`9.6xx10^(-3)`

B

`2.05xx10^(-4)`

C

`1.25xx10^(-6)`

D

`4.8xx10^(-5)`

Text Solution

Verified by Experts

The correct Answer is:
B
`K_(a)=c alpha^(2), c = 0.2 M, alpha = (3.2)/(100)=0.032`
`K_(a)=0.2xx(0.032)^(2)=2.05xx10^(-4)`
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