Question

1) List conditions under which combustion can take place.
2) Explain how the use of CNG in automobiles has reduced pollution in our cities.​

Answer 1

Answer 1:-

★ Combustion can take place in the presence of:-

• a combustible substance.
• oxygen, that is the supporter of combustion.
• attainment of ignition temperature of the substance.

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Answer 2:-

→ It gives out less carbon dioxide gas, carbon monoxide gas, Sulphur dioxide and nitrogen dioxide, which is beneficial as they play crucial role in global warming and acid rain. It leaves behind no residue after its combustion.

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More nformation:-

Combustion:-

• It is a chemical reaction in which heat is released by a material when it it reacts with oxygen.

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Fuel or combustible substance:-

• Any material that undergoes combustion is called a a combustible substance.

Answer 2

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1) List conditions under which combustion can take place.

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The conditions under which combustion takes place are as follows:

• Presence of combustible substance.
• Presence of supporter of combustion - oxygen.
• Attainment of ignition temperature.

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2) Explain how the use of CNG in automobiles has reduced pollution in our cities.

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• Compressed Natural Gas(CNG) is a clean fuel and does not give smoke when burnt as compared to other petroleum containing fuels like petrol and diesel.
• For automobiles to run, petroleum fuel is burnt.
• The combustion of fuel leaves unburnt carbon particles in the air, along with carbon monoxide(CO) - poisonous and harmful gas.
• Breathing CO causes headache,dizziness,etc.
• CNG burns completely leaving no harmful residue.
• Hence, the use of CNG in automobiles has reduced pollution in our cities.