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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 Analytical Chemistry MCQs

The molecular formula of Glucose is ____________?

  • NH₃
  • C₁₂H₂₂O₁₁
  • C₆H₁₂O₆
  • C₆H₆
0 Comments
Correct Answer: C. C₆H₁₂O₆

Explanation:

Glucose is a simple sugar and one of the most important carbohydrates found ... Read More Details

2 Analytical Chemistry MCQs

Identify the Molecular mass for Glucose (C₆H₁₂O₆) among the following.

  • 190 amu
  • 188 amu
  • 180 amu
  • 98 amu
0 Comments
Correct Answer: C. 180 amu

Explanation:

The molecular mass (molecular weight) of a compound is the sum of the ... Read More Details

3 Organic Chemistry MCQs

Ethene is the first member of __________?

  • Alkenes Family
  • Saturated hydrocarbon
  • Aromatic hydrocarbon
  • None of these
0 Comments
Correct Answer: A. Alkenes Family

Explanation:

Hydrocarbons are classified into different families based on the types of bonds between ... Read More Details

4 Environmental Chemistry MCQs

The petrol having octane number 80 has ____________?

  • 20% n-heptane + 80% iso-octane
  • 80% n-heptane + 20% iso-octane
  • 20% n-heptane + 80% n-octane
  • 80% n-heptane + 20% n-octane
0 Comments
Correct Answer: A. 20% n-heptane + 80% iso-octane

Explanation:

The octane number of petrol is a measure of its ability to resist ... Read More Details

5 Organic Chemistry MCQs

The organic compound used as antiknock agent in petroleum is____________?

  • (C₂H₅)₄Pb
  • TNT
  • CH₃MgBr
  • (C₂H₅)₂Hg
0 Comments
Correct Answer: A. (C₂H₅)₄Pb

Explanation:

In petroleum fuels, knocking is an undesirable phenomenon where fuel-air mixture in an ... Read More Details

6 Chemistry MCQs

The gas, commonly known as “laughing gas”, is ?

  • Carbon Dioxide
  • Sulfur Dioxide
  • Nitrous Oxide
  • Sodium Oxide
0 Comments
Correct Answer: C. Nitrous Oxide

Explanation:

The gas commonly referred to as "laughing gas" is Nitrous Oxide (N₂O), a ... Read More Details

7 Chemistry MCQs

Freezing point of water is ?

  • 0°C
  • -2°C
  • -4°C
  • None of above
0 Comments
Correct Answer: A. 0°C

Explanation:

The freezing point of water is defined as the temperature at which pure ... Read More Details

8 Chemistry MCQs

Rectified spirit contains alcohol about?

  • 80%
  • 95%
  • 70%
  • 85%
0 Comments
Correct Answer: B. 95%

Explanation:

Rectified spirit is a highly concentrated form of alcohol obtained by repeated distillation ... Read More Details

9 Chemistry MCQs

Which of the following elements is not present abundantly in Earth’s crust?

  • Silicon
  • Radium
  • Aluminum
  • Carbon
0 Comments
Correct Answer: B. Radium

Explanation:

The Earth's crust is made up of many chemical elements, but some are ... Read More Details

10 Chemistry MCQs

Basic metals can be converted into gold by:

  • Heating
  • Beating
  • Artificial nuclear radioactivity
  • Chemical reaction
0 Comments
Correct Answer: C. Artificial nuclear radioactivity

Explanation:

The idea of converting ordinary metals into gold has fascinated humans for centuries. ... Read More Details

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