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Q.

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 (Kf  of water = 1.86K Kg mol1  and coordination number of cobalt(III) = 6)

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a

van’t Hoff factor(i) = 3

b

Number of Cl  ions outside the coordination sphere = 2

c

oxidation number of  Co=+2

d

Number of Cl ions outside the coordination sphere = 3

answer is A, B.

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