What is a colloid? Give two examples of colloids (or colloidal solutions).
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A colloid is a kind of solution in which the size of solute particles is intermediate between those in true solutions and those in suspensions. Example: Soap solution, milk.
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The teacher instructed three students $‘A’, ‘B’$ and $‘C’$ respectively to prepare a $50 \%$ (mass by volume) solution of sodium hydroxide $(NaOH)$. $‘A’$ dissolved $50g$ of $NaOH$ in $100\ mL$ of water, $‘B’$ dissolved $50\ g$ of $NaOH$ in $100\ g$ of water while $‘C’$ dissolved $50\ g$ of $NaOH$ in water to make $100\ mL$ of solution. Which one of them has made the desired solution and why?
You are given two samples of water labelled as $‘A’$ and $‘B’$. Sample $‘A’$ boils at $100^\circ\ C$ and sample $‘B’$ boilsa $102^\circ\ C$. Which sample of water will not freeze at $0^\circ C$? Comment.