Q.

Bio gas is a better fuel than animal dung cake because

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a

Animal dung cake has high calorific value

b

Bio gas has lower calorific value

c

Bio gas smokeless fuel and its does not leave any residue

d

Bio gas is used as a fuel for cooking only whereas, dung cake can be used for cooking, and illuminant the lanterns

answer is C.

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Detailed Solution

Bio gas burns completely without giving smoke and any residue, so it is a better fuel than animal dung cakes bio gas has high calorific value and also used for domestic purpose also.

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Bio gas is a better fuel than animal dung cake because