The substances that sublime can be made to liquefy by

Compare in tabular form the properties of true solution and colloids with respect to Tyndall effect and stability.

What is meant by crystallisation? How is impure copper sulphate purified by the process?

Why does a mixture not have a fixed melting or a fixed boiling point?

The teacher instructed three students '$A$','$B$',and '$C$' respectively to prepare a $50\%$ (mass by volume) solution of sodium hydroxide $(NaOH)$. '$A$' dissolved $50\, g$ 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?

Describe any three properties of colloids. Categorise the following examples of colloids into different categories of colloids: Jelly,fog,milk,shaving cream.