Question

Equivalent conductivity at infinite dilution for sodium potassium oxalate `(COO^(-))_(2)Na^(+)K^(+)` will be [given, molar conductivities of oxalate, `K^+ and Na^(+)` ions at infinite dilution are 148.2, 50.1, 73.5 S `cm^(2)mol^(-1)`, respectively]
A. `271.8cm^(2)eq^(-1)`
B. `67.95S" "cm^(2)eq^(-1)`
C. `543.6S" "cm^(2)eq^(-1)`
D. `135.9S" "cm^(2)eq^(-1)`

Answer 1

Correct Answer - D
`lamda_(M)^(oo)=lamda_(M)^(oo)("Oxalate")+lamda_(M)^(oo)(Na^(+))+lamda_(M)^(oo)(k^(+))`
`lamda_(M)^(oo)=(148.2+50.1+73.5)S" "cm^(2)mol^(-1)`
`lamda_(M)^(oo)=271.8S" "cm^(2)mol^(-1)`
`thereforelamda_(Eq)^(oo)=(271.8)/(2)=135.9S" "cm^(2)eq^(-1)(lamda_(eq)^(oo)=(lamda_(M)^(oo))/("n. factor"))`