NCERT Class VIII Science Solutions: Chapter 6-Combustion and Flame Part 2

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Question 3:

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

Answer:

CNG produces very small amounts of harmful products like Sulphur dioxide, oxides of nitrogen, oxides of sulphur etc. CNG is a cleaner fuel.

Image result for automobile

For Automobile

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Question 4:

Compare LPG and wood as fuels.

Answer:

Compare LPG and wood as fuels.

Properties

LPG

Wood

Energy/unit mass

Produces more

Produces less energy

Pollution

energy Less pollution

More pollution

Residue

Leave no residue

Leave ash as residue

Storage/Transport

Easy to store & transport

Need more space to store