Question

when sugar dissolved in water, there is no increase in volume.. explain..

Answer 1

When sugar is dissolved in water,there is now increase in volume because the sugar molecules occupy the empty spaces present between water molecules and thus there is no extra space taken by sugar particles.But if the water is already saturated,the sugar will occupy extra space and then there will be increase in water.
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Answer 2

The sugar will occupy the empty spaces between the water molecules and thus, there will be no increase in the volume of water.