Which of the following are physical changes?
$(i)$ Melting of iron metal
$(ii)$ Rusting of iron
$(iii)$ Bending of an iron rod
$(iv)$ Drawing a wire of iron metal

State whether the following statement is true or false:
Metals are malleable,ductile,sonorous,and lustrous.

Classify each of the following as an element,compound,or mixture:
Gold,Air,Marble,Milk,Sugar.

Give an example each for the mixture having the following characteristics. Suggest a suitable method to separate the components of these mixtures:
$(a)$ $A$ volatile and a non-volatile component.
$(b)$ Two volatile components with appreciable difference in boiling points.
$(c)$ Two immiscible liquids.
$(d)$ One of the components changes directly from solid to gaseous state.
$(e)$ Two or more coloured constituents soluble in some solvent.

You are given two samples of water labelled as $A$ and $B$. Sample $A$ boils at $100\,^{\circ}C$ and sample $B$ boils at $102\,^{\circ}C$. Which sample of water will not freeze at $0\,^{\circ}C$? Comment.

Name the appropriate methods to separate the following:
$(i)$ Nitrogen from air
$(ii)$ Dye from blue ink
$(iii)$ Butter cream from milk
$(iv)$ Ammonium chloride from common salt