Correct order of limiting molar conductivity for cations in water at $298 \ K$ is $:$
- A$H^{+} > Na^{+} > K^{+} > Ca^{2+} > Mg^{2+}$
- B$H^{+} > Ca^{2+} > Mg^{2+} > K^{+} > Na^{+}$
- C$Mg^{2+} > H^{+} > Ca^{2+} > K^{+} > Na^{+}$
- D$H^{+} > Na^{+} > Ca^{2+} > Mg^{2+} > K^{+}$
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