Q2 of 19 Page 149

Answer the following questions

Why are carbon and its compounds used as fuels?

A. Carbon and its compounds used as fuels due to the following reasons:


1. When most of the carbon and its compounds is burnt in air, it gives a lot of heat, light and energy.


2. They have high calorific value. Thus, on burning in air, they give large amount of heat and energy.


3. When saturated hydrocarbon (hydrocarbon having single bond) is burnt in air, less smoke with a clean flame is produced.


Note: Calorific value is the amount of heat liberated in calories by the complete combustion of a combustible material with oxygen.


More from this chapter

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1

Select the proper option and complete the statements

(single, all, double, ionic, carbon, give and take, hydrogen, multiple, share, most, covalent)


A. A carbon atom forms a …… bond with other atoms. In this bond the two atoms …. electrons.


B. All the carbon bonds in a saturated hydrocarbon ....…. electrons.


C. At least one carbon bond in an unsaturated hydrocarbon is ….


D. …. is the essential element in all the organic compounds?


E. The element hydrogen is present in …. organic compound.

 2

Answer the following questions

In which compound forms does carbon occur?

 2

Answer the following questions

Write the uses of diamond.

 3

Explain the difference:

A. Diamond and graphite.


B. Crystalline and non-crystalline forms of carbon.