Which of the following fuel is the least polluting?

CNG

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Diesel

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LPG

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Hydrogen

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Solution

The correct option is D
Hydrogen

The by-product of hydrogen when used as a fuel and burnt is water while that of CNG are water and carbon dioxide gas. Water is an absolutely harmless by-product, however carbon dioxide in the environment causes green house effect leading to global warming. Hence, hydrogen can be called the cleanest fuel.

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Similar questions

Fuel	Calorific Value (kj/g)
charcoal	33
coal	25.33
wood	17
diesel	45
kerosene	48
petrol	50
biogas	35 to 40
butane (LPG)	50
methane	55
hydrogen	150

Based on the table above, which of the following is the correct sequence in which the fuels that give out most heat to the least heat energy will be arranged?
(a) hydrogen, wood, coal, biogas, methane
(b) methane, kerosene, diesel, charcoal
(c) coal, kerosene, petrol, hydrogen
(d) hydrogen, butane, diesel, kerosene

Arrange the following fuels in the order of increasing calorific values ( keeping the fuel with lowest calorific value first) :
LPG, Coal, Alcohol, Dung cakes, Diesel

Which of the following fuels has the highest calorific value ?

Kerosene, Wood, Hydrogen, Cow-dung cakes, LPG

Question 93

If the price of petrol, diesel and LPG is slashed as follows

$\begin{matrix} Fuel & Old price/litre (in Rs) & New price/litre(in Rs) & % Decrease Petrol/L & 45.62 & 40.62 & ___Diesel/L & 32.86 & 30.86 & ___LPG/14.2 kg & 304.70 & 279.70 & ___ \end{matrix}$
Complete the above table.

Q. Which among the following can be used as an alternative fuel for diesel?

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