Exothermic Reaction

Q.

Which of the following is not a combustion reaction?

1. Boiling of water

2. Melting of wax

3. Burning of petrol

4. Freezing of water

Q. 1. What is meant by combustion reaction

Q.

Which of the following is not a combustion reaction?

1. Freezing of water

2. Melting of wax

3. Burning of petrol

4. Boiling of water