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You are given two solutions, one of whic...

You are given two solutions, one of which is a concentrated solution of soap and the other is a solution of sugar. How can you ascertain whether they are true solutions or colloidal solutions?

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If light is allowed to pass through both the solutions, the one that scatters light is the colloidal solution (in this case, the soap solution). The other is the true solution (in this case, the sugar solution).
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