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: Hydrochloric acid reacts with sodium hydroxide to form:
A) Salt only
B) Gas
C) Salt and water
D) Water only
✅ Correct Answer: C
Explanation: This neutralization forms salt (NaCl) and water.
Q: Which of these is a greenhouse gas?
A) Helium
B) Carbon dioxide
C) Argon
D) Oxygen
✅ Correct Answer: B
Explanation: CO₂ traps heat in Earth’s atmosphere, contributing to warming.
Q: Most reactive non-metal element is:
A) Oxygen
B) Sulfur
C) Chlorine
D) Fluorine
✅ Correct Answer: D
Explanation: Fluorine is the most electronegative and highly reactive non-metal.
Q: Metalloids show properties of:
A) Non-metals
B) Metals
C) Both
D) None
✅ Correct Answer: C
Explanation: Metalloids exhibit intermediate properties between metals and non-metals.
Q: The number of neutrons in an atom is found by:
A) Atomic number – protons
B) Mass number – atomic number
C) Atomic number + electrons
D) Protons – electrons
✅ Correct Answer: B
Explanation: Neutron count = mass number – atomic number.