Why does a copper sulphate solution in water not show the Tyndall effect,while a mixture of water and milk does?

What are metalloids? Give examples.

What happens when
$(i)$ a saturated solution is heated?
$(ii)$ a saturated solution is cooled slowly?

What is distillation? List the two conditions essential for using this as a method of separation of components of a mixture.

$(a)$ Give any one point of difference between true solution,colloidal solution,and suspension.
$(b)$ $20 \, g$ of sodium chloride is dissolved in $100 \, mL$ of water. How will you test whether the given solution is saturated or unsaturated at the given temperature?
$(c)$ Suggest any one method by which we can increase the solubility of saturated solutions.

Which of the following will show Tyndall effect? Why?
$(a)$ Salt solution
$(b)$ Milk
$(c)$ Copper sulphate solution
$(d)$ Starch solution.