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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)`
Lcaves no residue like ash I buns withoul snoke.
Its heating capacity is high
Bio-gas is also used for lighting.
(ii) Solar water hcater
Solar cooker
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