Question

15. A: Presence of oxygen is very necessary for combustion.
R: combustion is a chemical process in which a substance reacts with carbon dioxide to give out heat energy.
1) both A and R are true and R is correct explanation of the assertion.
2) both A and R are false
3) A is true but R is false
4) A is false but it's true​

Answer 1

Answer:

Explanation:

3 option is correct

as CO2 is not helpful in combustion than oxygen because it reduces the rate of combustion

Answer 2

$\sf \pmb{Answer :}$

3 option is correct

as CO2 is not helpful in combustion than oxygen because it reduces the rate of combustion