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 of the following is a diatomic molecule?
A) Carbon
B) Sodium
C) Nitrogen
D) Neon
✅ Correct Answer: C
Explanation: N₂ is a diatomic molecule naturally found in air.
Q: The law of conservation of mass was proposed by?
A) Newton
B) Mendeleev
C) Lavoisier
D) Dalton
✅ Correct Answer: C
Explanation: Lavoisier stated that mass is neither created nor destroyed in chemical reactions.
Q: Which gas turns limewater milky?
A) Oxygen
B) Carbon dioxide
C) Nitrogen
D) Hydrogen
✅ Correct Answer: B
Explanation: CO₂ reacts with limewater to form insoluble CaCO₃.
Q: Which type of reaction is burning of wood?
A) Decomposition
B) Combustion
C) Substitution
D) Combination
✅ Correct Answer: B
Explanation: Combustion involves reaction with oxygen producing heat.