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: The gas used in the Haber process is:
A) Oxygen
B) Ammonia
C) Hydrogen
D) Methane
✅ Correct Answer: C
Explanation: Hydrogen reacts with nitrogen to produce ammonia.
Q: The periodic table was developed by:
A) Newton
B) Curie
C) Einstein
D) Mendeleev
✅ Correct Answer: D
Explanation: Dmitri Mendeleev arranged elements by atomic mass, predicting new ones.
Q: When two atoms share a pair of electrons, the bond formed is:
A) Hydrogen
B) Ionic
C) Covalent
D) Metallic
✅ Correct Answer: C
Explanation: Shared electron pairs form covalent bonds.
Q: Atomic mass is measured in:
A) Atomic mass units
B) Moles
C) Joules
D) Grams
✅ Correct Answer: A
Explanation: The atomic mass unit (amu) standardizes atomic weights.
Q: Boiling point of water at sea level is:
A) 100°C
B) 125°C
C) 75°C
D) 50°C
✅ Correct Answer: A
Explanation: Water boils at 100°C under standard atmospheric pressure.
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.