Least efficient fuel is
(1) Coal
(3) Wood
(2) Cow-dung cake
(4) LPG
.
Answers
Answered by
1
cow dung cake
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Answered by
4
The least efficient fuel is wood.
because wood causes deforestation also wood is incomplete burning fuel which gives remains such as coal, ash, etc.
Wood burning also causes air pollution.
hope it helps...
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