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: Which of the following is a strong acid?
A) Hydrochloric acid
B) Acetic acid
C) Citric acid
D) Carbonic acid
✅ Correct Answer: A
Explanation: HCl is a strong acid that fully ionizes in water.
Q: Chlorophyll contains which metal ion?
A) Copper
B) Magnesium
C) Iron
D) Zinc
✅ Correct Answer: B
Explanation: Magnesium is at the center of the chlorophyll molecule.
Q: The chemical formula of calcium carbonate is?
A) CaO
B) Ca(OH)₂
C) CaCO₃
D) CaCl₂
✅ Correct Answer: C
Explanation: Calcium carbonate is CaCO₃ and is found in limestone and marble.
Q: Which gas is used to fill balloons?
A) Nitrogen
B) Oxygen
C) Hydrogen
D) Helium
✅ Correct Answer: D
Explanation: Helium is non-flammable and lighter than air, making it ideal for balloons.
Q: Alcohols are characterized by which functional group?
A) –CHO
B) –COOH
C) –NH₂
D) –OH
✅ Correct Answer: D
Explanation: Alcohols contain the hydroxyl (–OH) functional group.
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.