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: Electrons orbit the nucleus and carry what type of charge?
A) Negative
B) Neutral
C) No charge
D) Positive
✅ Correct Answer: A
Explanation: Electrons are negatively charged particles found outside the nucleus.
Q: Carbon belongs to which group in the periodic table?
A) Group 14
B) Group 1
C) Group 2
D) Group 18
✅ Correct Answer: A
Explanation: Carbon is placed in Group 14 due to its 4 valence electrons.
Q: Metals typically react with acids to produce which gas?
A) Oxygen
B) Hydrogen
C) Chlorine
D) Carbon dioxide
✅ Correct Answer: B
Explanation: Hydrogen gas is released when most metals react with dilute acids.
Q: The formula H₂O stands for how many atoms?
A) 1
B) 3
C) 4
D) 2
✅ Correct Answer: B
Explanation: H₂O contains two hydrogen atoms and one oxygen atom, making a total of three.
Q: A substance with a pH of 2 is considered to be:
A) Strong acid
B) Neutral
C) Weak acid
D) Weak base
✅ Correct Answer: A
Explanation: A pH of 2 indicates a high concentration of hydrogen ions, hence a strong acid.
Q: The backbone of all organic molecules is made of:
A) Nitrogen
B) Oxygen
C) Sulfur
D) Carbon
✅ Correct Answer: D
Explanation: Carbon's ability to form four bonds makes it the core of organic compounds.
Q: Table salt is a combination of sodium and:
A) Magnesium
B) Phosphorus
C) Chlorine
D) Fluorine
✅ Correct Answer: C
Explanation: Sodium chloride (NaCl) forms when sodium reacts with chlorine.
Q: Potassium is part of which group on the periodic table?
A) Alkali metals
B) Noble gases
C) Halogens
D) Transition metals
✅ Correct Answer: A
Explanation: Potassium is an alkali metal, known for its reactivity.
Q: Inert gases belong to which group?
A) Group 17
B) Group 2
C) Group 1
D) Group 18
✅ Correct Answer: D
Explanation: Noble gases in Group 18 are chemically stable due to full outer shells.
Q: How many protons are found in an oxygen atom?
A) 8
B) 12
C) 10
D) 6
✅ Correct Answer: A
Explanation: The atomic number of oxygen is 8, indicating it has 8 protons.