When 1 mole of a solute is dissolved in \( 1 \mathrm{~kg} \) of \( \mathrm{H}_{2} \mathrm{O} \),...

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When 1 mole of a solute is dissolved in \( 1 \mathrm{~kg} \) of \( \mathrm{H}_{2} \mathrm{O} \), boiling point of solution was found to be \( 100.5^{\circ} \mathrm{C} \). \( K_{b} \) for \( \mathrm{H}_{2} \mathrm{O} \) is:
(a) \( 0.5 \)
(b) 100
(c) \( 100.5 \)
(d) \( 95.5 \)
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