Which of the following are physical changes ?

I) Melting of ice

II) Rusting of iron

III) Burning of iron fillings

IV) Drawing a wire of iron metal

Choose the correct option :

i) Melting of ice $\to$ solid to liquid.

No new substances is formed so it is a physical change.

ii) Rusting of iron $4Fe+3O_2\to 2F{e}_2{O}_3$ new compound is formed so it is a chemical change.

iii) Burning of iron fillings when iron fillings burns, it react with oxygen from the air to form iron oxide. $4Fe+3O_2\stackrel{\Delta }{\to }2F{e}_2{O}_3$.  So it is a chemical change

iv) Drawing a wire of iron metal $\to$ only shape.

Size has changed so it is also physical change.