Define chromatography.

Compare physical and chemical changes.

When is a solution said to be saturated? How can you change an unsaturated solution to a saturated solution without adding any more solute to it?

$(a)$ Name the separation techniques which you will apply for the separation of the following mixtures:
$(i)$ Small pieces of metal in the engine oil of a car.
$(ii)$ Fine mud particles suspended in water.
$(iii)$ Oil from water.
$(iv)$ Sodium chloride from its solution in water.
$(v)$ Camphor from salt.
$(vi)$ Wheat grains from husk.
$(b)$ Classify the following as a chemical or physical change:
$(i)$ Water boils to form steam.
$(ii)$ Burning of paper.
$(iii)$ An almirah gets rusted.
$(iv)$ Making a fruit salad with raw fruits.

Identify the dispersed phase and dispersing medium in the following colloids:
$(a)$ Fog
$(b)$ Cheese
$(c)$ Coloured gemstone

$(a)$ List any three characteristics of a colloid.
$(b)$ Name the two components of a colloid.
$(c)$ Identify colloids from the following mixtures:
Muddy water,sugar in water,ink,blood,soda water,foam.