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Question

A sugar solution contains $$15\mbox{%}$$ sugar by weight. When the solution is heated, $$40\mbox{%}$$ sugar is left in the solution. The amount of water which has disappeared is 


A
0.0625 g
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B
62.5 g
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C
0.625 g
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D
6.25 g
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Solution

The correct option is B $$62.5\space g$$
Let the mass of the solution = 100 g
Mass of sugar = 15 g
Mass of water = 100 - 15 = 85 g
On heating some water is disappeared and let the new amount of solution be $$X$$ g, which contains $$40\mbox{%}$$ sugar equal to $$15g$$
$$x\times\displaystyle\frac{40}{100} = 15$$
$$x = 37.5g$$
After heating mass of the solution is $$37.5g$$
Mass of water = mass of solution -  mass of sugar = 37.5 - 15 = 22.5 g
Amount of water disappeared on heating = 85 - 22.5 = 62.5g

Chemistry

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