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The molar conductance of NaCl, HCl and C...

The molar conductance of NaCl, HCl and `CH_(3)COONa` at infinite dilution are 126.45, 426.16 and 91 `ohm^(-1) cm^(2) mol^(-1)` respectively. The molar conductance of `CH_(3)COOH` at infinite dilution is :

A

`390.71 S cm^(2) mol^(-1)`

B

`698.28 S cm^(2) mol^(-1)`

C

`540.48 S cm^(2) mol^(-1)`

D

`201.28 S cm^(2) mol^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
A
According to Kohlrausch law of independent migration of ions.
`Lamda_(m)^(@) (CH_(3)COOH)`
`=Lamda_(m)^(@) (CH_(3)COONa)+ Lamda_(m)^(@) (HCl)- Lamda_(m)^(@) (NaCl)`
`=91.0 + 426.16 - 126.45(S cm^(2) mol^(-1))`
=390.71 S `cm^(2) mol^(-1)`
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