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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 Chemistry MCQs

What is the principal constituent of the Earth’s atmosphere?

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

Explanation:

The Earth’s atmosphere is a layer of gases that surrounds our planet, providing ... Read More Details

2 Chemistry MCQs

Lignite, bituminous, and anthracite are different ranks of which substance?

  • Iron
  • Coal
  • Wood
  • None of these
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Correct Answer: B. Coal

Explanation:

Coal is a fossil fuel formed from plant material that has been subjected ... Read More Details

3 Chemistry MCQs

Which of the six noble gases in the periodic table is the lightest?

  • Nitrogen
  • Hydrogen
  • Helium
  • Oxygen
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Correct Answer: C. Helium

Explanation:

The noble gases are a group of chemical elements in Group 18 of ... Read More Details

4 Chemistry MCQs

Which is the most abundant element in the Earth’s atmosphere?

  • Nitrogen
  • Hydrogen
  • Nickel
  • Oxygen
0 Comments
Correct Answer: A. Nitrogen

Explanation:

The most abundant element in the Earth’s atmosphere is Nitrogen (N₂). Nitrogen constitutes ... Read More Details

5 Chemistry MCQs

Which gas is produced by a photocopier machine?

  • Ozone
  • Carbon dioxide
  • Sulfur dioxide
  • None of these
0 Comments
Correct Answer: A. Ozone

Explanation:

Photocopier machines are widely used in offices and schools for duplicating documents. During ... Read More Details

6 Chemistry MCQs

How many grams are there in one ounce (oz)?

  • 20 grams
  • 24 grams
  • 28 grams
  • 32 grams
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Correct Answer: C. 28 grams

Explanation:

An ounce (oz) is a unit of mass commonly used in the Imperial ... Read More Details

7 Chemistry MCQs

What is the name of the process used to make soap?

  • Saponification
  • Hydrolysis
  • Condensation
  • Polymerisation
0 Comments
Correct Answer: A. Saponification

Explanation:

Soap is made through a chemical process called saponification, which is a type ... Read More Details

8 Organic Chemistry MCQs

The rate of an E1 elimination reaction depends on which factor?

  • The concentration of the substrate
  • The concentration of the nucleophile
  • The concentration of both substrate and nucleophile
  • The concentration of base and nucleophile
0 Comments
Correct Answer: A. The concentration of the substrate

Explanation:

The E1 reaction (elimination unimolecular) is a type of elimination reaction in organic ... Read More Details

9 Organic Chemistry MCQs

Elimination bimolecular (E2) reactions involve which type of kinetics?

  • First-order kinetics
  • Second-order kinetics
  • Third-order kinetics
  • Zero-order kinetics
0 Comments
Correct Answer: B. Second-order kinetics

Explanation:

The E2 reaction (elimination bimolecular) is one of the fundamental types of elimination ... Read More Details

10 Organic Chemistry MCQs

Why is the Grignard reagent highly reactive?

  • Because of the presence of a halogen atom
  • Because of the presence of a magnesium atom
  • Because of the polarity of the C–Mg bond
  • All of the above
0 Comments
Correct Answer: C. Because of the polarity of the C–Mg bond

Explanation:

Grignard reagents, with the general formula R–MgX (where R is an alkyl or ... Read More Details

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