Chemistry MCQs
Our Chemistry MCQs section is tailored for students and job seekers aiming for excellence in academic and competitive exams. It includes a vast selection of multiple-choice questions covering organic chemistry, inorganic chemistry, analytical chemistry, physical chemistry, and biochemistry. These MCQs are suitable for FSc, BSc, pre-medical, and pre-engineering students, as well as CSS, PMS, NTS, and other competitive exams in Pakistan. Designed by subject experts, the questions help reinforce key concepts, test analytical skills, and improve speed and accuracy. Each topic includes beginner to advanced-level questions with a focus on the latest syllabus and past papers. If you are preparing for university entry tests or government job recruitment exams, this resource offers an excellent opportunity to master chemistry topics effectively.
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.
Q: Which of these is a noble gas?
A) Nitrogen
B) Chlorine
C) Oxygen
D) Neon
✅ Correct Answer: D
Explanation: Neon is a noble gas found in Group 18 of the periodic table.
Q: Rusting of iron is an example of which process?
A) Neutralization
B) Sublimation
C) Oxidation
D) Reduction
✅ Correct Answer: C
Explanation: Rusting involves the oxidation of iron in the presence of water and oxygen.
Q: The pH value of lemon juice is approximately?
A) 9
B) 5
C) 7
D) 2
✅ Correct Answer: D
Explanation: Lemon juice is highly acidic, with a pH around 2.
Q: Element with atomic number 6 is?
A) Helium
B) Nitrogen
C) Oxygen
D) Carbon
✅ Correct Answer: D
Explanation: Carbon has an atomic number of 6 and forms the basis of organic chemistry.
Q: Covalent bonds are formed by?
A) Sharing of electrons
B) Loss of neutrons
C) Gaining protons
D) Transfer of electrons
✅ Correct Answer: A
Explanation: Covalent bonds involve the sharing of electrons between atoms.