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: Boiling point of water in Celsius is?
A) 100ยฐC
B) 120ยฐC
C) 50ยฐC
D) 0ยฐC
โœ… Correct Answer: A
Explanation: Water boils at 100ยฐC at standard pressure.
Q: Which element has the lowest atomic mass?
A) Lithium
B) Helium
C) Hydrogen
D) Beryllium
โœ… Correct Answer: C
Explanation: Hydrogen has an atomic mass of about 1 amu.
Q: Which chemical is used to bleach clothes?
A) Calcium carbonate
B) Ethanol
C) Sodium chloride
D) Hydrogen peroxide
โœ… Correct Answer: D
Explanation: Hโ‚‚Oโ‚‚ is a strong oxidizer and bleaching agent.
Q: Which salt is formed when HCl reacts with NaOH?
A) NaCl
B) NHโ‚„Cl
C) CaClโ‚‚
D) KCl
โœ… Correct Answer: A
Explanation: HCl + NaOH โ†’ NaCl + Hโ‚‚O, a neutralization reaction.
Q: Which element is liquid at room temperature?
A) Gallium
B) Iodine
C) Bromine
D) Mercury
โœ… Correct Answer: D
Explanation: Mercury is the only metal liquid at room temp.