Professor X mixed two solutions in a test tube and observed that the mixture was warm. He also tried to mix 50-ml each of the solutions in a 100-ml volumetric flask and found out that the total volume was less than 100 ml. He only has water, methanol, ethanol, and acetone in his table. From the following choices, what solutions did Professor X mix?   a.acetone and water b.water and methanol c.acetone and ethanol d.methanol and ethanol

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