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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

Which metal is the best conductor of electricity?

  • Copper
  • Gold
  • Silver
  • Lead
0 Comments
Correct Answer: C. Silver

Explanation:

Electrical conductivity is a physical property of metals that measures their ability to ... Read More Details

2 Chemistry MCQs

Why is diamond harder than graphite?

  • Difference in crystalline structure
  • Tetrahedral structure of diamond
  • Difference in layers of atoms
  • None of these
0 Comments
Correct Answer: A. Difference in crystalline structure

Explanation:

Diamond and graphite are both allotropes of carbon, meaning they are composed of ... Read More Details

3 Chemistry MCQs

Isotopes of an element have the same number of ?

  • Neutrons
  • Protons
  • Electrons
  • Beta Rays
0 Comments
Correct Answer: B. Protons

Explanation:

Isotopes are different forms of the same chemical element that have the same ... Read More Details

4 Chemistry MCQs

The second name of ethyl alcohol is __________?

  • Ethene
  • Ethanol
  • Propyl
  • None
0 Comments
Correct Answer: B. Ethanol

Explanation:

Ethyl alcohol, commonly known as alcohol, is an organic compound widely used in ... Read More Details

5 Chemistry MCQs

Permanent hardness of water caused by metal sulphates can be removed by using which of the following?

  • Zeolites
  • Sulphonides
  • Lime
  • Nitrates
0 Comments
Correct Answer: A. Zeolites

Explanation:

Permanent hardness of water is caused by the presence of dissolved salts of ... Read More Details

6 Chemistry MCQs

Which gas is usually released when an acid reacts with a metal?

  • Ammonia gas
  • Chlorine
  • Oxygen
  • Hydrogen gas
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Correct Answer: D. Hydrogen gas

Explanation:

When an acid reacts with a metal, a chemical reaction occurs that usually ... Read More Details

7 Chemistry MCQs

Which symbol is used to represent the proton number?

  • M
  • Z
  • P
  • A
0 Comments
Correct Answer: B. Z

Explanation:

In chemistry, the proton number is a fundamental concept in atomic structure. The ... Read More Details

8 Chemistry MCQs

Elements that have the same number of protons but a different number of neutrons are called what?

  • Isotopes
  • Isomers
  • Allotropes
  • Allomers
0 Comments
Correct Answer: A. Isotopes

Explanation:

In chemistry, the term isotopes refers to atoms of a single element that ... Read More Details

9 Chemistry MCQs

Brass gets discoloured in air due to the presence of which gas?

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

Explanation:

Brass is an alloy made mainly of copper (Cu) and zinc (Zn). When ... Read More Details

10 Chemistry MCQs

A breath test used by traffic police to check drunken driving works on which chemical reaction?

  • Turmeric on filter paper
  • Silica gel coated with silver nitrate
  • Potassium permanganate–sulphuric acid
  • Potassium dichromate–sulphuric acid
0 Comments
Correct Answer: D. Potassium dichromate–sulphuric acid

Explanation:

The breath test for detecting alcohol consumption relies on a simple but effective ... Read More Details

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