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

The calorific value of hydrogen is about:
A. 1000 kJ/g
B. 150 kJ/g
C. 50 kJ/g
D. 30 kJ/g
Answer: Option B
Solution (By JKExamLibrary)
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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Which of the following polymers is a thermosetting plastic?
A. Nylon
B. Bakelite
C. PVC
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Correct Answer: Option B


Explanation:
Bakelite (phenol-formaldehyde) is thermosetting; once set, it cannot be remolded. Polyethylene, PVC, and nylon are thermoplastics – they soften on heating.

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Question #2
The formation of MgO from Mg and O₂ involves:
A. No electron transfer
B. Sharing of electrons
C. Transfer of electrons from O to Mg
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Correct Answer: Option D


Explanation:
Magnesium oxide (MgO) is an ionic compound. Magnesium (2,8,2) loses two electrons to become Mg²⁺, and oxygen (2,6) gains two electrons to become O²⁻. This electron transfer forms an electrovalent (ionic) bond. Covalent bonds involve sharing (e.g., H₂O).

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Question #3
Which of the following metals is the best conductor of heat?
A. Silver
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Correct Answer: Option A


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