Which of the following is not a combustion reaction?

Boiling of water

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Melting of wax

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Burning of petrol

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Freezing of water

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Solution

The correct options are
A
Boiling of water

B
Melting of wax

D
Freezing of water

A combustion reaction is when two substances combine to form another substance as the product. Burning of petrol is an example of combustion reaction.

On the other hand, no combustion takes place in boiling of water, freezing of water and melting of wax because they are just physical changes.

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Similar questions

Question 1

Which of the following is a physical change?
(a) Rusting of iron
(b) Combustion of magnesium ribbon
(c) Burning of candle
(d) Melting of wax

Classify the following as a physical or a chemical change :

(a) Drying of wet clothes

(b) Manufacture of salt from seawater.

(d) Boiling of water

(e) Burning of paper

(f) Melting of wax

(g) Burning of coal

Classify the following examples into physical or chemical change. [1 MARK]

1) Photosynthesis and burning of coal

2) Dissolving sugar in water and melting of wax

Which of the following does not involve a chemical reaction ?

(a) digestion of food in our body

(b) process of respiration

(d) melting of candle wax on heating

Q. Question 1

Which of the following is not a physical change?

(a) Boiling of water to give water vapour
(b) Melting of ice to give water
(c) Dissolution of salt in water
(d) Combustion of Liquefied Petroleum Gas (LPG)

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