A 10% solution is one in which 10 gm of solute is dissolved in 100 gm of water.

Question

10 %

solution is one in which 10 gm of solute is dissolved in 100 gm of water. On heating the solution water evaporates. So, 1 kg of the

10 %

solution is reduced to 0.4 kg. What is its concentration now?

Options:

A . 32.6%

B . 14.8%

C . 22.7%

D . 29.4%

Answer: Option D
:
D
In a

10 %

solution, in 110 gm of solution there is 10gm of solute.
So, 1 kg of solution has

1 \times \frac{10}{110} = \frac{1}{11}

kg of solute.
After heating, amount of solution = 0.4 kg
So, amount of water

= \frac{2}{5} - \frac{1}{11} = \frac{17}{55}

kg
Solution percentage

= (\frac{1}{11}) \times (\frac{55}{17}) \times 100 = 29.4 %

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