Name the technique used to separate:
$(i)$ Butter from curd,
$(ii)$ Salt from sea-water,
$(iii)$ Camphor from salt.

Which separation techniques will you apply for the separation of the following?
$(a)$ Sodium chloride from its solution in water.
$(b)$ Ammonium chloride from a mixture containing sodium chloride and ammonium chloride.
$(c)$ Small pieces of metal in the engine oil of a car.
$(d)$ Different pigments from an extract of flower petals.
$(e)$ Butter from curd.

What type of mixtures are separated by the technique of crystallisation?

Explain the following giving examples:
$(a)$ Saturated solution
$(b)$ Pure substance

Explain the following giving examples.
$(a)$ Colloid
$(b)$ Suspension

Pragya tested the solubility of four different substances at different temperatures and collected the data as given below (results are given in the following table,as grams of substance dissolved in $100 \,g$ of water to form a saturated solution).

< strong>Substance Dissolved	< strong>$283 \,K$	< strong>$293 \,K$	< strong>$313 \,K$	< strong>$333 \,K$	< strong>$353 \,K$
Potassium nitrate	$21$	$32$	$62$	$106$	$167$
Sodium chloride	$36$	$36$	$36$	$37$	$37$
Potassium chloride	$35$	$35$	$40$	$46$	$54$
Ammonium chloride	$24$	$37$	$41$	$55$	$66$

$(a)$ Find the solubility of each salt at $293 \,K$. Which salt has the highest solubility at this temperature?
$(b)$ What is the effect of change of temperature on the solubility of a salt?