Why is biogas considered an ideal fuel for domestic use?
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Biogas is considered an ideal fuel for domestic use because:
Biogas burns without smoke and hence does not cause air pollution.
Biogas has a high calorific value. That is, biogas produces a large amount of heat per unit mass.
Biogas is cheaper than most common fuels.
Biogas is a clean fuel since it burns completely without leaving any residue behind.
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The calorific value and ignition temperature of fuel A are $55 kJ / g$ and $80^{\circ} C$, respectively. These values for fuel B are $80 kJ / g$ and $10^{\circ} C$, respectively. On burning, the fuel A produces $CO _2$ and $H _2 O$ while the fuel B produces $CO _2, CO$ and $SO _2$. Give three points of relative and disadvantages of these two fuels.