How can you convert a saturated solution into an unsaturated solution?

State whether the following statement is true or false:
Non-metals are lustrous and good conductors of heat and electricity.

$(a)$ Define an element.
$(b)$ Identify non-metals from the following elements: Carbon,Potassium,Silicon,Chlorine,Mercury.

Distinguish between miscible and immiscible liquids. Name the techniques used to separate these liquids.

Define a solution. Give an example of $(i)$ gas in liquid solution $(ii)$ gas in gas solution.

Suggest separation technique$(s)$ one would need to employ to separate the following mixtures:
$(a)$ Mercury and water
$(b)$ Potassium chloride and ammonium chloride
$(c)$ Common salt,water and sand
$(d)$ Kerosene oil,water and salt