Previous year MCQs

General science UPPSC 2017 GS-I
Question

If an unsaturated sugar solution is prepared by mixing 100 grams of sugar with half a litre of water, which of the following physical quantities will not change?

Answer & Solution

Answer: (Detailed Solution Below)

Option D: volume

Detailed Solution:

The correct answer is “volume”.
Volume will not change when you mix 100 grams of sugar with half a liter of water to prepare an unsaturated sugar solution.  

1) The mass will increase due to the addition of sugar.

2) The density will increase because the mass increases while the volume remains constant.

3) The concentration will increase as the amount of solute (sugar) in the solution increases.

4) The volume of the solution will remain constant. When sugar dissolves in water, the sugar molecules fill the spaces between the water molecules, not increasing the overall volume.  

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