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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.

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1 Physical Chemistry MCQs

Which of the following is not named after a scientist?

  • Pauli Exclusion Principle
  • Hund’s Rule
  • Aufbau Principle
  • Le-Chatelier’s Principle
0 Comments
Correct Answer: C. Aufbau Principle

Explanation:

In chemistry, many principles and rules are named after the scientists who discovered ... Read More Details

2 Environmental Chemistry MCQs

For the generation of biogas, the materials commonly used are ?

  • Animal wastes
  • Forest residues
  • Aquatic plants
  • None of the above
0 Comments
Correct Answer: A. Animal wastes

Explanation:

Biogas is a renewable source of energy produced by the anaerobic digestion of ... Read More Details

3 Inorganic Chemistry MCQs

What is the electronic configuration of Sodium (Na)?

  • 1s² 2s² 2p⁶
  • 1s² 2s² 2p⁶ 3s²
  • 1s² 2s² 2p⁶ 3s¹
  • None of these
0 Comments
Correct Answer: C. 1s² 2s² 2p⁶ 3s¹

Explanation:

Sodium (Na) is an element with atomic number 11. This means it has ... Read More Details

4 Environmental Chemistry MCQs

Air is a/an __________?

  • Compound
  • Element
  • Electrolyte
  • Mixture
0 Comments
Correct Answer: D. Mixture

Explanation:

Air is not a single substance but a physical mixture of different gases. ... Read More Details

5 Inorganic Chemistry MCQs

The element commonly used for the formation of alloys is __________?

  • Iron
  • Calcium
  • Mercury
  • Chromium
0 Comments
Correct Answer: D. Chromium

Explanation:

Alloys are mixtures of metals (or metals with non-metals) designed to improve specific ... Read More Details

6 Inorganic Chemistry MCQs

The bond energy of hydrogen fluoride (H–F) is __________?

  • 456 kJ/mol
  • 562 kJ/mol
  • 281 kJ/mol
  • None of these
0 Comments
Correct Answer: B. 562 kJ/mol

Explanation:

Bond energy refers to the amount of energy required to break one mole ... Read More Details

7 Organic Chemistry MCQs

Benzene mainly undergoes __________?

  • Addition reactions
  • Substitution reactions
  • Halogenation
  • None of the above
0 Comments
Correct Answer: B. Substitution reactions

Explanation:

Benzene (C₆H₆) is the simplest aromatic hydrocarbon and exhibits very unique chemical properties ... Read More Details

8 Inorganic Chemistry MCQs

The chemical formula of sand is ___________?

  • Si₂O₃
  • SiO₂
  • Al₂O₃
  • Sr₂O
0 Comments
Correct Answer: B. SiO₂

Explanation:

Sand is one of the most abundant natural materials found on Earth, primarily ... Read More Details

9 Physical Chemistry MCQs

Which of the following mixtures can be separated by the sublimation method?

  • Sand and Iron filings
  • Sand and Naphthalene
  • Both A & B
  • None of these
0 Comments
Correct Answer: B. Sand and Naphthalene

Explanation:

Sublimation is a separation technique based on the physical property of certain solids ... Read More Details

10 Physical Chemistry MCQs

Why do we determine the boiling point of a liquid?

  • To check its acidity and basicity
  • To check temperature
  • To check its purity and nature
  • None of these
0 Comments
Correct Answer: C. To check its purity and nature

Explanation:

Determining the boiling point of a liquid is one of the most fundamental ... Read More Details

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