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 formula for methane is?
A) CH₄
B) C₂H₄
C) C₂H₆
D) CO₂
✅ Correct Answer: A
Explanation: Methane is CH₄, the simplest alkane and a major greenhouse gas.
Q: Which element is used in thermometers?
A) Zinc
B) Lead
C) Silver
D) Mercury
✅ Correct Answer: D
Explanation: Mercury remains liquid at room temperature and expands evenly.
Q: Which acid is found in vinegar?
A) Sulfuric acid
B) Nitric acid
C) Acetic acid
D) Citric acid
✅ Correct Answer: C
Explanation: Acetic acid gives vinegar its sour taste and smell.
Q: Metalloids have properties of?
A) Both metals and non-metals
B) Metals only
C) Gases only
D) Non-metals only
✅ Correct Answer: A
Explanation: Metalloids exhibit mixed properties of both groups.
Q: Which of the following is a base?
A) H₂SO₄
B) CH₃COOH
C) HCl
D) NaOH
✅ Correct Answer: D
Explanation: Sodium hydroxide is a strong base.
Q: Boiling point of water in Celsius is?
A) 100°C
B) 120°C
C) 50°C
D) 0°C
✅ Correct Answer: A
Explanation: Water boils at 100°C at standard pressure.
Q: Which element has the lowest atomic mass?
A) Lithium
B) Helium
C) Hydrogen
D) Beryllium
✅ 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
✅ Correct Answer: D
Explanation: H₂O₂ is a strong oxidizer and bleaching agent.
Q: Which salt is formed when HCl reacts with NaOH?
A) NaCl
B) NH₄Cl
C) CaCl₂
D) KCl
✅ Correct Answer: A
Explanation: HCl + NaOH → NaCl + H₂O, a neutralization reaction.
Q: Which element is liquid at room temperature?
A) Gallium
B) Iodine
C) Bromine
D) Mercury
✅ Correct Answer: D
Explanation: Mercury is the only metal liquid at room temp.