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Name the major constituent of biogas. Wr...

Name the major constituent of biogas. Write the properties of biogas which make it a good fuel.
ii. Name the two devices that work using heat energy of the sun.

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(i) Methane/`CH_(4)`
Leaves no residue like ash.
It burns without smoke.
Its heating capacity is high.
Bio-gas is also used for lighting.
(ii) Solar water heater.
Solar cooker.
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