Question

Which is better fuel between A and B - study the table to give the answer.

Fuel	Calorific value	Ignition temperature	Products obtained on burning
A	$75\raisebox{1ex}{$kJ$}\!\left/ \!\raisebox{-1ex}{$kg$}\right.$	${25}^{\circ }C$	${\mathrm{CO}}_2,\mathrm{CO},\mathrm{ASH}$
B	$50\raisebox{1ex}{$kJ$}\!\left/ \!\raisebox{-1ex}{$kg$}\right.$	${75}^{\circ }C$	${\mathrm{CO}}_2$

Answer 1

Good Fuel

1. Should have moderate ignition temperature higher than room temperature otherwise it is hard to handle.
2. Should not produce harmful gas like Carbon Monoxide $\left(\mathrm{CO}\right)$ on burning.
3. Should have more calorific value.

Fuel B is better than Fuel A because:

1. Fuel A has a high calorific value but has a very low ignition temperature of ${25}^{\circ }C$ which is almost room temperature.
2. Fuel A also produces carbon monoxide, which has a serious impact on human health.
3. Fuel B has a moderate ignition temperature, i.e. ${75}^{\circ }C$, which makes it safe for day-to-day life.
4. Fuel B has a moderate calorific value, i.e. $50\raisebox{1ex}{$kJ$}\!\left/ \!\raisebox{-1ex}{$kg$}\right.$.

Hence, Fuel B is better fuel than Fuel A.