Question

1.
A substance burns completely in...​

Answer 1

Answer:

Combustion is a chemical process wherein a substance reacts with oxygen to produce energy in the form of heat or light or both. It is an oxidation process because it involves the burning of a fuel, completely or partially in the presence of air.

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Answer 2

ᴀʙᴜɴᴅᴀɴᴄᴇ ᴏғ ᴏxʏɢᴇɴ .....