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If the molar conductivities ("in" S cm^(...

If the molar conductivities `("in" S cm^(2) "mol"^(-1))` of NaCl,KCl and NaOH at infinite dilution are 126, 150 and 250 respectively, the molar conductivity of KOH `("in" S "cm"^(2) "mol"^(-1))` is -

A

526

B

226

C

26

D

274

Text Solution

Verified by Experts

The correct Answer is:
D
`126 = lambda_(Na^(+))^(infty) + lambda_(Cl^(-))^(infty)`
`150 = lambda_(K^(+))^(infty) + lambda_(Cl^(-))^(infty)`
`250 = lambda_(Na^(+))^(infty) + lambda_(OH^(-))^(infty)`
`= (150 + 250- 126) = lambda_(K^(+))^(infty) + lambda_(OH^(-))^(infty)`
or 274
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