$(a)$ 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.

(N/A) The separation techniques are:
$(i)$ Filtration: Used to separate solid particles from a liquid.
$(ii)$ Centrifugation: Used to separate fine suspended particles.
$(iii)$ Separating funnel: Used to separate immiscible liquids like oil and water.
$(iv)$ Evaporation: Used to separate a dissolved solid from its solvent.
$(v)$ Sublimation: Used to separate a sublimable solid (camphor) from a non-sublimable one (salt).
$(vi)$ Winnowing: Used to separate lighter husk from heavier grains.
$(b)$ Classification of changes:
Chemical change: $(ii)$ Burning of paper and $(iii)$ Rusting of an almirah (new substances are formed).
Physical change: $(i)$ Boiling of water and $(iv)$ Making a fruit salad (no new substances are formed,only physical state or appearance changes).