Combustion of fuel is a:

physical change

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chemical change

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reversible change

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irreversible change

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Solution

The correct options are
B chemical change
D irreversible change
Combustion of fuel is a chemical process which occurs in the presence of air to release carbon dioxide, water vapour and energy. The chemical reaction is as follows:

${Fuel + O}_{2} (g) \to {CO}_{2} (g) + H_{2} O (g) + Energy$

This is an example of a chemical change as new substances such as carbon dioxide and water vapour is formed. Chemical changes are irreversible in nature so the given reaction is irreversible.

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Similar questions

Burning of a candle is a chemical as well as physical change, why?

1. The physical change occurs when the wax of candle melts and it loses its shape
2. The chemical change is combustion of fuel in presence of oxygen. This leads to the production and emission of carbon dioxide from the flame
3. The burning of a candle is only a chemical change
4. The burning of a candle is only a physical change

Q. Change in enthalpy

(Δ H)

for combustion of fuel is:

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

Q. Diborane is a potential rocket fuel which undergoes combustion according to the reaction

B_{2} H_{6} (g) + 3 O_{2} (g) \to B_{2} O_{3} (s) + 3 H_{2} O (g)

From the following data, calculate the enthalpy change for the combustion of diborane.

Q. Group the following into physical change and chemical change.

Dissolving salt in

H_{2} O,

burning of a fuel, rusting or iron, melting of ice cube.

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