Which of the following represents the correct increasing order of calorific value of the givenfuels?A) Hydrogen < LPG < Biogas < Cow dung cake < coalB) Cow dung cake < Biogas < LPG < Coal < HydrogenC) Cow dung cake < Coal < Biogas < LPG < HydrogenD) Hydrogen < Cow dung cake < LPG < Biogas < Coa

The correct increasing order of calorific value of the given fuels is option B) Cow dung cake < Biogas < LPG < Coal < Hydrogen.

Here's why:

1. Cow dung cake: It has the lowest calorific value among the given options. Cow dung cakes are a type of biomass fuel and generally, biomass fuels have lower calorific values compared to fossil fuels and gases.

2. Biogas: Biogas, which is produced from the anaerobic decomposition of organic matter, has a higher calorific value than cow dung cakes but is still lower than LPG, coal, and hydrogen.

3. LPG (Liquefied Petroleum Gas): LPG has a higher calorific value than both cow dung cakes and biogas. It is a type of petroleum gas that has been liquefied for ease of storage and transport.

4. Coal: Coal, a fossil fuel, has a higher calorific value than cow dung cakes, biogas, and LPG. The calorific value of coal can vary depending on its type, but it is generally higher than the previous fuels.

5. Hydrogen: Hydrogen has the highest calorific value among the given options. It is a high-energy fuel and when it burns, it releases a large amount of energy per unit mass, hence its high calorific value.