Question

hi help me dear mates
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Answer 1

Answer:

Those reaction in which oxygen react with other substance to give heat and light are called combustion reactions.

Example: Burning of coal.

Burning of methane.

Explanation:

Hope it helps you.

Answer 2

Explanation:

when two or more substances combine together to form new substance , the reaction is known as combination reaction. Remember, the product of combination reaction will always be a compound .

e.g. 1 . Na+Cl=NaCl

2. C + O2 = CO2