Chapter 5 : Coal and Petroleum - Ncert Solutions for Class 8 Science CBSE
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Chapter 5 - Coal and Petroleum Excercise 62
(i) They can be burnt directly.
(ii) They can be transported easily through pipe lines.
(iii) They are clean fuels and do not give smoke when burnt.
(iv) They have high calorific value.
Concept insight: gaseous fuels are considered best fuels as they are economical and create less pollution.
(b) Process of separation of different constituents from petroleum is called __refining__.
(c) Least polluting fuel for vehicles is __compressed natural gas (CNG)__.
Concept insight: coal and petroleum are formed from dead plants and animals buried in the earth which were decomposed under immense pressure and heat.
(b) CNG is more polluting fuel than petrol. False
Concept insight: CNG is a gaseous fuel so is a better and less polluting fuel than petrol.
(c) Coke is almost pure form of carbon. True
(d) Coal tar is a mixture of various substances. True
(e) Kerosene is not a fossil fuel. False
Concept insight: Kerosene is obtained by fractional distillation of petroleum so it is a fossil fuel.
Chapter 5 - Coal and Petroleum Excercise 63
(iii) Black in colour
Uses of coke:
(i) In manufacture of steel.
(ii) In the extraction of metals (as a reducing agent).
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