Three different solutions of the following three complexes are prepared by dissolving 24.8 g of the complex in 1 kg of deionised water (atomic weight of cobalt $= 59$ ). Given $K_{b} = 0.56 K /$ molal and $K_{f} = 1.86 K /$ molal .

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TestHub · Accepted Answer

Effective molality 'im' for all three solutions are the same. So they all have same colligative properites as well as vapour pressure. Solution I does not conduct electricity as it is not an electrolyte.

$im = 1 \times \frac{2.48}{248} = 2 \times \frac{2.48}{2 \times 248} = 3 \times \frac{2.48}{3 \times 248} = 0.01$

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JEE Advanced (2028)