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If pK(a)=-"log"K(a)=4, and K(a)=Cx^(2-) ...

If `pK_(a)=-"log"K_(a)=4`, and `K_(a)=Cx^(2-)` then Van't Hoff factor for weak monobasic acid when `C=0.01M` is:

A

`1.01`

B

`1.02`

C

`1.10`

D

`1.20`

Text Solution

Verified by Experts

The correct Answer is:
C
`HA harr^(+)+A^(-)`
`i=[1+y-1x]=1+x`
`pK_(a)=4-0log K_(a)`
`:.K_(a)-10^(4)=Cx^(2)`
`1xx10^(-4)=0.1xx x^(2)`
`x=0.1`
`:.i=1+x=1.1`
Hence, (C) is the correct answer.
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