Q2 of 27 Page 1

Why is biogas considered as an excellent fuel?

Biogas contains about 50%of methane which is the actual fuel. It is an excellent fuel because:

•It doesn’t lead to air pollution since combustion of biogas is smoke free.


•It is a clean fuel, since it doesn’t leave any residues.


•It produces a large amount of heat per unit mass and therefore, has high calorific value.


•It is economical and cheap.


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How it can be proved that the basic structure of the Modern Periodic Table is based on the electronic configuration of atoms of different elements?

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(a) Group and period in the Modern Periodic Table.


(b) Name and write its one physical property.


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