Q.

We have 100 mL of  0.1 M KCl solution. To make it 0.2M:

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a

evaporate 50 mL water

b

evaporate 50 mL solution

c

add 0.1 mol KCl

d

add 0.01 mol KCl

answer is D.

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Detailed Solution

100×0.1=0.2×VV=50 mL

So, volume of solution should decrease by 50 mL without decreasing quantity of KCI. By adding 0.01 mol KCl, Total moles = 0.02

KCl solution 0.2M

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