The calorific value of hydrogen is about: MCQ with Answer and Explanation

The calorific value of hydrogen is about:
A. 30 kJ/g
B. 1000 kJ/g
C. 50 kJ/g
D. 150 kJ/g
Answer: Option D
Solution (By JKSSB Mock Tests)
Hydrogen has a very high calorific value of about 141.9 kJ/g (higher heating value) or ~150 kJ/g approximate. This makes it an excellent fuel, though storage is challenging. Methane ~55 kJ/g, petrol ~47 kJ/g. Hydrogen fuel cells use it efficiently.

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Practice More chemistry Questions

Question #1
Mendeleev predicted the existence of an element 'eka-silicon', later discovered and named:
A. Arsenic
B. Gallium
C. Germanium
D. Scandium

Correct Answer: Option C


Explanation:
Mendeleev left gaps and predicted properties of eka-boron (scandium), eka-aluminium (gallium), and eka-silicon (germanium). Germanium was discovered in 1886, its properties matched predictions, confirming the periodic law.

This question belongs to: Science chemistry
Question #2
Which group of elements is known as halogens?
A. Group 1
B. Group 2
C. Group 17
D. Group 18

Correct Answer: Option C


Explanation:
Group 17 (F, Cl, Br, I, At) are halogens (salt formers). They have 7 valence electrons, high electronegativity, and are highly reactive non-metals. Group 1 are alkali metals, 18 noble gases, 2 alkaline earth metals.

This question belongs to: Science chemistry
Question #3
The phenomenon where a product of a reaction acts as a catalyst for the same reaction is called:
A. Negative catalysis
B. Heterogeneous catalysis
C. Autocatalysis
D. Enzyme catalysis

Correct Answer: Option C


Explanation:
Autocatalysis occurs when one of the products of a chemical reaction acts as a catalyst for that same reaction. As the reaction proceeds and the product accumulates, the rate of the reaction increases. A classic example is the oxidation of oxalic acid by potassium permanganate, where the Mn2+ ions produced catalyze the reaction.

This question belongs to: Science chemistry