Burning of wax is an example of a (an)

(i) reversible change               (ii) physical change                 

(iii) irreversible change          (iv) chemical change

Burning of wax is both a Chemical change and an Irreversible change because new products are formed like ${\text{CO}}_2,H_{2}O,etc\mathrm{....}$ and products cannot be reversed into reactants.