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: Which acid is used in car batteries?
A) Sulfuric acid
B) Nitric acid
C) Acetic acid
D) Hydrochloric acid
✅ Correct Answer: A
Explanation: Lead-acid batteries contain sulfuric acid.
Q: The most abundant element in Earth’s crust is:
A) Oxygen
B) Iron
C) Silicon
D) Calcium
✅ Correct Answer: A
Explanation: Oxygen makes up about 46% of Earth’s crust by weight.
Q: During electrolysis of water, the gas collected at the cathode is:
A) Oxygen
B) Hydrogen
C) Nitrogen
D) Carbon dioxide
✅ Correct Answer: B
Explanation: Hydrogen is released at the negatively charged electrode.
Q: Which color indicates a strong base on universal indicator?
A) Blue
B) Purple
C) Red
D) Green
✅ Correct Answer: B
Explanation: Strong bases turn indicators dark purple.
Q: Bleaching powder is chemically known as:
A) Calcium oxychloride
B) Calcium chloride
C) Calcium carbonate
D) Calcium hydroxide
✅ Correct Answer: A
Explanation: Bleaching powder is CaOCl₂, used for disinfection.