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Question

$$100$$gm of an aq. solution of sugar contains $$40\%$$ sugar by mass. How much water should be evaporated get $$50\%$$ sugar solution by mass?


A
10g
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B
20g
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C
0.0g
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D
40g
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Solution

The correct option is A $$10g$$
$$\underline{\text{Initial condition}}:-$$ $$40\%$$ sugar (by mass),
Therefore, In $$100gm$$ of an aqueous solution, $$40g$$ sugar and $$60g$$ water is present.
$$\underline{\text{Final condition}}:-$$ $$50\%$$ sugar (by mass),
Therefore, In $$100gm$$ of an aqueous solution, $$50g$$ sugar and $$50g$$ water is present.
Amount of water to be evaporated $$=60-50=10\text{ }grams$$

Chemistry

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