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MAT Exam 2020 Paper

Question : 107 of 200

Marks: +1, -0

4 \%

Solution:

Concept:

Solubility limit determines the minimum water needed to keep all salt dissolved.

Explanation:

4\%

solution in

1

kg means:

Salt

= 1000 \times \frac{4}{100} = 40

Water

= 1000 - 40 = 960

Maximum solubility is

25

g salt per

100

g water.

For

40

g salt, the minimum water required is:

\frac{40}{25} \times 100 = 160

Thus, water that must evaporate is:

960 - 160 = 800

Evaporation rate is

28

g per hour, so time is:

\frac{800}{28} \approx 28.57

hours

This is approximately

29

hours.

Answer:

A. 29 h

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