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Molar conductivity of a 0.01 M solution ...

Molar conductivity of a 0.01 M solution of a weak monobasic acids HA is `156cm^(2)mol^(-1)` at 298 K. What is the pH of this solution if `lamda_(m)^(@)` of HA `390S cm^(2)mol^(-1)`

A

3

B

2.4

C

4.3

D

6.2

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