Correct option is A
Given:
Initial volume of the solution = 5 litres
Salt concentration in the solution = 3%
Two litres of water evaporated, meaning the new volume of the solution =5−2=3 litres.
Concept Used:
When water evaporates, the quantity of salt remains the same, but the total volume of the solution decreases. Therefore, the percentage of salt in the remaining solution will increase because the same amount of salt is now dissolved in a smaller volume.
Formula Used:
Solution:
The initial salt concentration is 3%, which means:
The remaining solution has a volume of 3 litres, and the amount of salt is still 0.15 litres (since only water evaporated, not the salt).
So, the new percentage of salt is:
Thus, the percentage of salt in the remaining solution is 5%.
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