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K(a) for formic acid and acetic acid are...

`K_(a)` for formic acid and acetic acid are `2.1xx10^(-4)` and `1.1xx10^(-5)` respectively. The relative strength of acids is:

A

`19:1`

B

`2.3:1`

C

`1:2.1`

D

`4.37:1`

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The correct Answer is:
d
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