(C) The incorrect statement is $C$. Biogas is primarily composed of methane $(CH_4)$,not ethane. Biogas burns without smoke and leaves behind no resid

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The main ingredient of biogas is ethane and it gives a lot of smoke and also produces a lot of residual ash.

(C) The incorrect statement is $C$. Biogas is primarily composed of methane $(CH_4)$,not ethane. Biogas burns without smoke and leaves behind no residual ash,making it a clean fuel. Options $A$,$B$,and $D$ are scientifically correct statements regarding biomass and biogas production.

Class 10 Science Sources of Energy Mix Examples - Sources of Energy

Medium

Choose the incorrect statement.

A
We are encouraged to plant more trees so as to ensure a clean environment and also provide biomass fuel.
B
Gobar-gas is produced when crops,vegetable wastes,etc.,decompose in the absence of oxygen.
C
The main ingredient of biogas is ethane and it gives a lot of smoke and also produces a lot of residual ash.
D
Biomass is a renewable source of energy.