info@jobexams.pk
Job Exams Hero

Chemistry MCQs

Prepare for competitive exams with our topic-wise Chemistry MCQs covering fundamental and advanced concepts. These multiple-choice questions include atomic structure, chemical bonding, periodic table, acids & bases, organic chemistry, thermodynamics, chemical equations, mole concept, electrochemistry, and biochemistry. Ideal for science students and job aspirants appearing in PPSC, FPSC, CSS, NTS, SPSC, BPSC, KPSC, ETEA, AJKPSC, and other testing services. A valuable resource for teachers, educators, and candidates targeting science educator posts, laboratory roles, and general science sections in public sector exams.

Browse Categories
Quick Results 0 found

Question Coming Soon!

"" isn't in our database yet, but we're adding new questions daily.

1 Inorganic Chemistry MCQs

Which gas is released when limestone reacts with water?

  • Hydrogen
  • Oxygen
  • Nitrogen
  • Carbon Dioxide
0 Comments
Correct Answer: D. Carbon Dioxide

Explanation:

Limestone is primarily composed of calcium carbonate (CaCO₃). When limestone reacts with water ... Read More Details

2 Physical Chemistry MCQs

Which process occurs when no heat enters or leaves the system?

  • Isochoric
  • Isobaric
  • Adiabatic
  • Isothermal
0 Comments
Correct Answer: C. Adiabatic

Explanation:

In thermodynamics, processes are classified based on how energy and work are exchanged ... Read More Details

3 Physical Chemistry MCQs

Which system can exchange both matter and energy with its surroundings?

  • Open system
  • Closed system
  • Isolated system
  • Inert system
0 Comments
Correct Answer: A. Open system

Explanation:

In thermodynamics, systems are classified based on how they interact with their surroundings. ... Read More Details

4 Physical Chemistry MCQs

Which properties do not depend on the mass of a substance?

  • Extensive properties
  • Colligative properties
  • Intensive properties
  • None of these
0 Comments
Correct Answer: C. Intensive properties

Explanation:

Properties of matter are classified into intensive and extensive properties based on whether ... Read More Details

5 Physical Chemistry MCQs

Which system exchanges only energy with its surroundings?

  • Open system
  • Closed system
  • Isolated system
  • None of the above
0 Comments
Correct Answer: B. Closed system

Explanation:

In thermodynamics, systems are classified based on their ability to exchange matter and ... Read More Details

6 Chemistry MCQs

Permanent hardness of water is due to the presence of ?

  • Sodium bicarbonate
  • Calcium sulfate
  • Calcium bicarbonate
  • None of the above
0 Comments
Correct Answer: B. Calcium sulfate

Explanation:

Water hardness means water has dissolved minerals, mainly calcium and magnesium. Hard water ... Read More Details

7 Chemistry MCQs

Main constituent in air is ?

  • Oxygen
  • Nitrogen
  • Hydrogen
  • Helium
0 Comments
Correct Answer: B. Nitrogen

Explanation:

Air is a mixture of gases that forms the Earth’s atmosphere. It is ... Read More Details

8 Chemistry MCQs

Combustion can not take place without ?

  • Hydrogen
  • Air
  • Oxygen
  • Argon
0 Comments
Correct Answer: C. Oxygen

Explanation:

Combustion is a chemical process in which a substance reacts rapidly with oxygen ... Read More Details

9 Chemistry MCQs

Which number decides an element’s place in the Periodic Table?

  • Electron
  • Proton
  • Neutron
  • None of the above
0 Comments
Correct Answer: B. Proton

Explanation:

The Periodic Table organizes all chemical elements in order based on their atomic ... Read More Details

10 Chemistry MCQs

pH value of water is ?

  • 5
  • 5-6
  • 8.7-10.5
  • 6.5-8.5
0 Comments
Correct Answer: D. 6.5-8.5

Explanation:

The pH value measures how acidic or basic a substance is. For water, ... Read More Details

Question Categories
General Knowledge Category MCQ'S
Computer Category MCQ'S
Chemistry Category MCQ'S
Pak Departmental Laws & Rules MCQs