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: 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.