Q43. Molar ionic conductivities of divalent cation and anion are $57 \mathrm {~S} \mathrm {~cm} ^ { 2 } \mathrm {~mol} ^ { - 1 }$ and $73 \mathrm {~S} \mathrm {~cm} ^ { 2 } \mathrm {~mol} ^ { - 1 }$ respectively. The molar conductivity of solution of an electrolyte with the above cation and anion will be :\\
(1) $187 \mathrm {~S} \mathrm {~cm} ^ { 2 } \mathrm {~mol} ^ { - 1 }$\\
(2) $260 \mathrm {~S} \mathrm {~cm} ^ { 2 } \mathrm {~mol} ^ { - 1 }$\\
(3) $130 \mathrm {~S} \mathrm {~cm} ^ { 2 } \mathrm {~mol} ^ { - 1 }$\\
(4) $65 \mathrm {~S} \mathrm {~cm} ^ { 2 } \mathrm {~mol} ^ { - 1 }$