Rust is

Depositing one metal on another metal is

This metal is generally used for Galvanisation.

…… prevents the outer surface of potato from colouring.

Ascorbic acid is

Magnesium Hydroxide is

Lime water changes to milky is a

Ripening of fruits is a

Action of heat on paraffin wax is

In a physical change

Burning of sulphur in air is

The colour of magnesium oxide is

Rusting of iron is

Physical change is

Melting of wax is