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Biogas can be used as a source of energy because it is
Anon inflammable
Bchemically inert
Cheavier than water
Dinflammable
Answer & Solution
Correct answer: D. inflammable
1. Biogas is a mixture of gases produced by microbial activity.
2. It can be used as a source of energy because it is inflammable.
3. That is what allows it to be burnt for cooking and lighting.
4. An inert or non inflammable gas would be useless as a fuel.
_Source: NCERT Class 12 Biology Ch8 'Microbes in Human Welfare'_
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