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Negative deviation

Which one of the following non-ideal solutions shows the negative deviation: (a) CH3COCH3 + CS2   (b) C6H6 + CH3COCH3   (c) CCl4 + CHCl3   (d)  CH3COCH3 + CHCl3

Answer: (d) CH3COCH3 + CHCl3 is non ideal solution which shows negative deviation.

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