The constituent of air that supports combustion is __________

Nitrogen

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carbon-di-oxide

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Oxygen

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water vapour

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Solution

The correct option is C Oxygen
Combustion is a chemical process in which a substance reacts rapidly with oxygen and gives off heat. The original substance is fuel and the oxygen source is an oxidizer. Oxygen is essentially required to carry the process of combustion.

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Question 4

Identify the constituent of air from each of the following:

(a) The formation of water droplets on the outer surface of ice-cold lemon juice.

(b) A gas that turns lime-water milky.

(c) A gas that is a supporter of combustion.

Q. Oxygen is a neutral gas which supports combustion.

How would you show that hydrogen :

(a) is a non-supporter of combustion ?

(b) is lighter than air ?

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