Question

Match the LIST-I with LIST-II:

• A. A-IV, B-III, C-II, D-I
• B. A-IV, B-I, C-II, D-III
• C. A-I, B-II, C-III, D-IV
• D. A-III, B-II, C-IV, D-I

Hint:

Ranking fuels is easy: Gases are the most energetic, followed by Refined Liquids, then Hard Coals, and finally Soggy Biomass (like Peat).

Answer 1

The Correct Option is B

Concept: The calorific value (CV) represents the energy density of a fuel. It generally follows the trend: Gaseous fuels $>$ Liquid fuels $>$ High-rank Solid fuels $>$ Low-rank Solid fuels.

Step 1: Match A (Peat).
Peat (A) is the earliest stage of coal formation. It has the highest moisture content and lowest carbon density, resulting in a very low calorific value of approximately 6500 kJ/kg (IV).

Step 2: Match B (Petrol).
Petrol (B) is a highly refined liquid hydrocarbon with a high energy density, typically around 45000 kJ/kg (I).

Step 3: Match C (Anthracite coal).
Anthracite (C) is the highest rank of coal. It is dense and rich in carbon, giving it a high solid-fuel CV of about 30000 kJ/kg (II).

Step 4: Match D (Natural gas).
Natural gas (D), primarily methane, has the highest hydrogen-to-carbon ratio, giving it the highest energy density of the group at approximately 50000 kJ/kg (III).