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: Inert gases have how many electrons in their outermost shell?
A) 8
B) 4
C) 2
D) 1
✅ Correct Answer: A
Explanation: Noble gases have a full octet, making them chemically stable.
Q: The most reactive non-metal is?
A) Carbon
B) Sulfur
C) Fluorine
D) Oxygen
✅ Correct Answer: C
Explanation: Fluorine is the most reactive due to its high electronegativity.
Q: Which of the following is not a compound?
A) Oxygen
B) Water
C) Carbon dioxide
D) Sodium chloride
✅ Correct Answer: A
Explanation: Oxygen is an element, not a compound.
Q: Which process converts a liquid into gas?
A) Condensation
B) Melting
C) Sublimation
D) Evaporation
✅ Correct Answer: D
Explanation: Evaporation is the process of changing a liquid into a gas below boiling point.
Q: Isotopes differ in their number of?
A) Electrons
B) Ions
C) Neutrons
D) Protons
✅ Correct Answer: C
Explanation: Isotopes have the same number of protons but different neutrons.