Question

to form petrol is a
3. Melting of wax near the wick of a candle is
reversible change
change, but
buming or wax in the wick of the candle is
change​

Answer 1

Burning of candle is actually chemical change. Wax is basically made up of hydrocarbons. When you light the wick, the wax near the wick melts and then goes up through the thread through capillary action. Then the liquid turns to hot gas where the hydrocarbons are broken down.