Q46 of 87 Page 106

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

The use of petrol and diesel as fuels in automobiles is being replaced by CNG because

1) It produces very small amount of harmful gases.

2) It burns without smoke so it is a clean fuel.

Why does a goldsmith blow air into the kerosene lamp flame with a blow-pipe?

In which zone of a candle flame:

(a) partial combustion of fuel takes places, and

(b) complete combustion of fuel takes place?

What are the disadvantage of burning wood as fuel?

Give reason for the following:

LPG is a better domestic fuel than wood.