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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

Identify the monoatomic molecule among the following?

  • Helium
  • Ozone
  • Hydrogen
  • Nitrogen
0 Comments
Correct Answer: A. Helium

Explanation:

A molecule is formed when two or more atoms bond together chemically. While ... Read More Details

2 Chemistry MCQs

The one mole of _____ molecule has the highest number of atoms?

  • H2SO4
  • HClO4
  • O3
  • H2C2O4
0 Comments
Correct Answer: D. H2C2O4

Explanation:

The number of atoms in one mole of a substance depends on how ... Read More Details

3 Chemistry MCQs

The number of moles present in 9.5 g of CS₂ is: _________?

  • 1.5
  • 0.25
  • 0.125
  • None of These
0 Comments
Correct Answer: C. 0.125

Explanation:

The mole concept is fundamental in chemistry for converting between mass and the ... Read More Details

4 Chemistry MCQs

In periods from left to right, electronegativity will: _________?

  • Increase
  • Decrease
  • Constant
  • None of these
0 Comments
Correct Answer: A. Increase

Explanation:

Electronegativity is defined as the ability of an atom to attract electrons towards ... Read More Details

5 Organic Chemistry MCQs

The reaction of C₂H₅OH with conc. H₂SO₄ does not give __________?

  • Ethene
  • Diethyl ether
  • Acetylene
  • Ethyl hydrogen sulphate
0 Comments
Correct Answer: C. Acetylene

Explanation:

Ethanol (C₂H₅OH) reacts with concentrated sulfuric acid (H₂SO₄) under different conditions to produce ... Read More Details

6 Organic Chemistry MCQs

Identify the Lucas reagent among the following:

  • Conc. HCl & Anhydrous ZnCl₂
  • Dil. HCl & Hydrated ZnCl₂
  • Conc. HNO₃ & Anhydrous ZnCl₂
  • Conc. HNO₃ & Anhydrous MgCl₂
0 Comments
Correct Answer: A. Conc. HCl & Anhydrous ZnCl₂

Explanation:

Lucas reagent is a widely used reagent in organic qualitative analysis to distinguish ... Read More Details

7 Chemistry MCQs

Alcohols of lower molecular weight are _______________?

  • More Soluble in water
  • Insoluble in water
  • Soluble in water on heating
  • Insoluble in all solvents
0 Comments
Correct Answer: A. More Soluble in water

Explanation:

Alcohols are organic compounds that contain a hydroxyl group (-OH) attached to a ... Read More Details

8 Chemistry MCQs

A device which converts chemical energy into electrical energy is called ?

  • Motor
  • Generator
  • Moving-coil galvanometer
  • Battery
0 Comments
Correct Answer: D. Battery

Explanation:

A device that converts chemical energy into electrical energy is called a battery ... Read More Details

9 Chemistry MCQs

The gas used in a refrigerator to cool water is ?

  • Nitrogen
  • Carbon dioxide
  • Methane
  • Tetrafluoroethane
0 Comments
Correct Answer: D. Tetrafluoroethane

Explanation:

Modern refrigerators rely on a specific type of gas known as a refrigerant ... Read More Details

10 Chemistry MCQs

CNG stands for?

  • Converted Natural Gas
  • Conduced Natural Gas
  • Conducted Natural Gas
  • Compressed Natural Gas
0 Comments
Correct Answer: D. Compressed Natural Gas

Explanation:

CNG stands for Compressed Natural Gas, a type of fuel that is widely ... Read More Details

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