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Resistance of \( 0.2 \mathrm{M} \) solution of an electrolyte is \( 50 \Omega \). The specific conductance of the solution is \( 1.3 \mathrm{~S} \mathrm{~m}^{-1} \). If resistance of the \( 0.4 \mathrm{M} \) solution of the same electrolyte is \( 260 \Omega \), its molar conductivity is :
(a) \( 6.25 \times 10^{-4} \mathrm{Sm}^{2} \mathrm{~mol}^{-1} \)
(b) \( 625 \times 10^{-4} \mathrm{Sm}^{2} \mathrm{~mol}^{-1} \)
(c) \( 62.5 \mathrm{~S} \mathrm{~m}^{2} \mathrm{~mol}^{-1} \)
(d) \( 6250 \mathrm{Sm}^{2} \mathrm{~mol}^{-1} \)
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