Chemistry MCQs
Chemistry MCQs cover organic, inorganic, physical, analytical, and biochemistry topics. Perfect for FSc, BSc, CSS, PMS, NTS, and competitive exams, they enhance concept mastery, analytical skills, speed, and accuracy for academic and job test success.
Q: The main ore of aluminum is?
A) Magnetite
B) Galena
C) Bauxite
D) Hematite
✅ Correct Answer: C
Explanation: Bauxite is the primary source of aluminum.
Q: Which element forms the basis of life?
A) Carbon
B) Hydrogen
C) Nitrogen
D) Oxygen
✅ Correct Answer: A
Explanation: Carbon forms the backbone of all organic molecules.
Q: The number of valence electrons in oxygen is?
A) 6
B) 2
C) 4
D) 8
✅ Correct Answer: A
Explanation: Oxygen has 6 electrons in its outer shell.
Q: An example of a polyatomic ion is?
A) Na⁺
B) OH⁻
C) Cl⁻
D) K⁺
✅ Correct Answer: B
Explanation: Hydroxide (OH⁻) is a common polyatomic ion.
Q: Which compound has a triple bond?
A) Ethene
B) Ethyne
C) Propane
D) Ethane
✅ Correct Answer: B
Explanation: Ethyne (C₂H₂) has a triple carbon-carbon bond.