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Correct order of limiting molar conductivity for cat ions in water at 298 K is :

1. H + > Na + > K + > Ca 2+ > Mg 2+
2. Mg 2+ > H + > Ca 2+ > K + > Na +
3. H + > Ca 2+ > Mg 2+ > K + > Na +
4. H + > Na + > Ca 2+ > Mg 2+ > K +

Correct answer: H + > Ca 2+ > Mg 2+ > K + > Na +

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