If the freezing point of a 0.01 molal aqueous solution of a cobalt(III) chloride-ammonia complex (which behaves as a strong electrolyte) is $- 0.0558 ° C$ . Then find the true statement about complex is ( $K_{f}$ of water = 1.86K Kg $m o l^{- 1}$ and coordination number of cobalt(III) = 6)

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van’t Hoff factor(i) = 3

oxidation number of $C o = + 2$

Number of $C l^{-}$ ions outside the coordination sphere = 3

Number of $C l^{-}$ ions outside the coordination sphere = 2

answer is A, B.

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