The fuel with the highest calorific value per gram is: MCQ with Answer and Explanation

The fuel with the highest calorific value per gram is:
A. Wood
B. Hydrogen
C. Methane
D. Coal
Answer: Option B
Solution (By JKSSB Mock Tests)
Hydrogen has about 141.9 kJ/g, the highest of any fuel. Methane ~55.5 kJ/g, coal ~25-35 kJ/g, wood ~17 kJ/g. Hydrogen produces only water on combustion, making it a clean fuel.

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Practice More chemistry Questions

Question #1
The scientific process of extracting a metal from its ore and refining it is called:
A. Mineralogy
B. Agriculture
C. Metallurgy
D. Geology

Correct Answer: Option C


Explanation:
Metallurgy is the science and technology of extracting metals from their ores, purifying them, and preparing them for use. It involves various steps like concentration, reduction, and refining. Mineralogy is the study of minerals, and geology is the study of the Earth's physical structure.

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Question #2
A catalyst that slows down a reaction is known as:
A. Inhibitor
B. Activator
C. Autocatalyst
D. Promoter

Correct Answer: Option A


Explanation:
Inhibitors (negative catalysts) decrease reaction rate. Promoters enhance activity of a catalyst; activators increase effectiveness; autocatalysts are reaction products that catalyze the reaction.

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Question #3
The salt used in the manufacture of plaster of Paris is:
A. CaCO₃
B. CaOClâ‚‚
C. Naâ‚‚SOâ‚„
D. CaSO₄·2H₂O

Correct Answer: Option D


Explanation:
Plaster of Paris is prepared by heating gypsum (CaSO₄·2H₂O) at 373 K, removing part of water of crystallization to form CaSO₄·½H₂O. CaCO₃ is limestone.

This question belongs to: Science chemistry