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: Which oxide is acidic in nature?
A) CaO
B) CO₂
C) MgO
D) Na₂O
✅ Correct Answer: B
Explanation: Carbon dioxide forms carbonic acid in water, showing acidic character.
Q: The molecular formula of glucose is:
A) C₆H₁₂O₆
B) CH₃COOH
C) C₂H₆O
D) C₆H₆
✅ Correct Answer: A
Explanation: Glucose contains 6 carbon, 12 hydrogen, and 6 oxygen atoms.
Q: Catalysts are substances that:
A) Change products
B) Stop reactions
C) Slow down reactions
D) Speed up reactions
✅ Correct Answer: D
Explanation: Catalysts accelerate reactions without being consumed.
Q: Hardness of water is due to:
A) Ca²⁺ and Mg²⁺
B) SO₄²⁻
C) NaCl
D) Iron
✅ Correct Answer: A
Explanation: Calcium and magnesium ions make water hard.
Q: To test for hydrogen, one should:
A) Use litmus
B) Use limewater
C) Apply a glowing splint
D) Use a burning splint
✅ Correct Answer: D
Explanation: Hydrogen burns with a pop sound when exposed to flame.