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JEE Main Chemistry question

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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 , the number of chloride(s) in the coordination sphere of the complex is ( of water = 1.86 K kg ) [JEE Advanced 2015]

Answer: 1

Solution

, so the complex yields 3 particles in solution: 1 complex cation and 2 free (ionisable) ions,

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Question ID VK-143444