Which of the following reactions is used to produce hydrogen for fuel cells? MCQ with Answer and Explanation

Question
Which of the following reactions is used to produce hydrogen for fuel cells?
A. Combustion of methane
B. Neutralization
C. Electrolysis of water
D. Saponification
Answer: Option C
Solution (By JKExamLibrary)
Electrolysis of water produces pure hydrogen and oxygen: 2H₂O → 2H₂ + O₂. Hydrogen is used in fuel cells to generate electricity. It can also be produced by steam reforming of natural gas, but electrolysis yields clean hydrogen if powered by renewable energy. Combustion of methane produces energy, not hydrogen. Neutralization gives salt and water.
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Question #1
The acid present in ant sting is:
A. Acetic acid
B. Lactic acid
C. Citric acid
D. Formic acid
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Correct Answer: Option D

Explanation:
Ant sting contains formic acid (methanoic acid, HCOOH), causing irritation. Nettle sting also contains formic acid. To neutralize, apply a base like baking soda. Acetic acid is in vinegar, citric acid in citrus fruits, lactic acid in sour milk and muscles. Formic acid is the simplest carboxylic acid.
This question belongs to: Science chemistry
Question #2
Which of the following plastics is used for making non-stick cookware?
A. Teflon
B. Polystyrene
C. PVC
D. Nylon
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Correct Answer: Option A

Explanation:
Teflon (PTFE) has low friction and high heat stability, ideal for non-stick coatings. PVC for pipes; polystyrene for packaging; nylon for fibers.
This question belongs to: Science chemistry
Question #3
The process of heating an ore strongly in the presence of excess air is called:
A. Smelting
B. Roasting
C. Leaching
D. Calcination
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Correct Answer: Option B

Explanation:
Roasting involves heating sulfide ores in excess air to convert them to oxides and remove sulfur as SO₂. Example: 2ZnS + 3O₂ → 2ZnO + 2SO₂. Calcination is heating in absence of air (for carbonates/hydroxides). Smelting is reduction. Leaching uses chemicals.
This question belongs to: Science chemistry
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