Vanadium(V) oxide is used as a catalyst in the manufacture of: MCQ with Answer and Explanation

Question
Vanadium(V) oxide is used as a catalyst in the manufacture of:
A. Nitric acid
B. Ammonia
C. Sulphuric acid
D. Sodium hydroxide
Answer: Option C
Solution (By JKExamLibrary)
V₂O₅ catalyzes the oxidation of SO₂ to SO₃ in the Contact process for sulfuric acid: 2SO₂ + O₂ ⇌ 2SO₃. Fe is used for ammonia (Haber). Pt-Rh gauze for nitric acid (Ostwald). Sodium hydroxide is made by chlor-alkali electrolysis, no catalyst needed. V₂O₅ is preferred over Pt because it is cheaper and less susceptible to poisoning by arsenic impurities.
This question belongs to: Science chemistry
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Question #1
The fuel used in a fuel cell is:
A. Kerosene
B. Hydrogen
C. Diesel
D. Coal
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Correct Answer: Option B

Explanation:
Hydrogen fuel cells combine H₂ and O₂ to produce electricity, heat, and water. It is a clean energy source. Coal, diesel, kerosene are conventional fuels burned in engines.
This question belongs to: Science chemistry
Question #2
An atom of element X has 6 protons and 8 neutrons. Its mass number is:
A. 2
B. 14
C. 6
D. 8
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Correct Answer: Option B

Explanation:
Mass number = protons + neutrons = 6 + 8 = 14. This corresponds to carbon-14 isotope. Atomic number = 6 (carbon).
This question belongs to: Science chemistry
Question #3
Assertion (A): The noble gases are placed in Group 18. Reason (R): They have a completely filled outermost shell (except Helium) and zero valency.
A. Both A and R are true but R is NOT the correct explanation of A.
B. A is false but R is true.
C. Both A and R are true and R is the correct explanation of A.
D. A is true but R is false.
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Correct Answer: Option C

Explanation:
Noble gases have completely filled valence shells (ns²np⁶, except He which is 1s²), making them highly stable and unreactive with a valency of zero. Because of this unique stability and distinct electronic configuration, they form a separate group, Group 18, in the modern periodic table.
This question belongs to: Science chemistry
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