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: Endothermic reactions:
A) Freeze
B) Absorb heat
C) Release heat
D) Explode
✅ Correct Answer: B
Explanation: Endothermic processes draw heat from surroundings, feeling cold.
Q: Water is considered a universal solvent because it:
A) Dissolves most substances
B) Evaporates quickly
C) Has low density
D) Is neutral
✅ Correct Answer: A
Explanation: Water dissolves a wide range of solutes due to polarity.
Q: How many electrons can the first energy level hold?
A) 18
B) 8
C) 32
D) 2
✅ Correct Answer: D
Explanation: The first shell (K-shell) can hold a maximum of 2 electrons as per the 2n² rule.
Q: The atomic number represents which quantity?
A) Valency
B) Mass number
C) Number of neutrons
D) Number of protons
✅ Correct Answer: D
Explanation: Atomic number equals the number of protons in an atom.
Q: Sodium reacts with water to form what?
A) Sodium carbonate
B) Sodium chloride
C) Sodium oxide
D) Sodium hydroxide and hydrogen
✅ Correct Answer: D
Explanation: Sodium forms NaOH and H₂ when it reacts vigorously with water.