There are two important fuels A and B both of which are extracted from deep inside the earth. Fuel A is a thick, dark, foul smelling liquid whereas fuel B is a black solid. Combustion of both the fuels produces products, C, D, E and F. The product C makes the rainwater only slightly acidic but it is mainly responsible for causing global warming. The product D is neither acidic nor basic. It is harmless and does not affect the environment in any way. Both E and F attack breathing system of humans and are mainly responsible for causing acid rain. In addition to combustion of fuels A and B, the product F is also formed when lightening occurs in the sky.

1. What are (i) fuel A, and (ii) fuel B?
2. Name (i) C and (ii) D (iii) E, and (iv) F
3. What is the process of formation of F during lightening known as?
4. Which fuel is supposed to be exhausted sooner: A or B?
5. Which fuel is mostly used for generating electricity at thermal power plants?

(a) Fuel A is petroleum as it is a thick, dark, foul-smelling liquid, and (ii) fuel B is coal as it is a black solid.

(b) (i) C is carbon dioxide as it makes the rainwater only slightly acidic but it is mainly responsible for causing global warming.

(ii) Product D is water as it is neither acidic nor basic.

(iii) Produce E is sulphur dioxide and

(iv) Produce F is nitrogen oxide as these products attack the breathing system of humans and are mainly responsible for causing acid rain. 

(c) Nitrogen fixation is the process of formation of F (nitrogen oxide) under lightening condition.

(d) Fuel A, petroleum, is supposed to be exhausted sooner.

(e) Fuel B, coal, is mostly used for generating electricity at thermal power plants.

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Updated on: 20-Mar-2023

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