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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

Why does ethyl alcohol (ethanol) have a higher boiling point than acetone?

  • Due to hydrogen bonding
  • Due to high molecular weight
  • Due to its acidic nature
  • Due to its low molecular weight
0 Comments
Correct Answer: A. Due to hydrogen bonding

Explanation:

The boiling point of a substance depends mainly on the strength of its ... Read More Details

2 Physical Chemistry MCQs

The boiling point of ethyl alcohol (ethanol) is ?

  • 78°C
  • 58°C
  • 73°C
  • 56°C
0 Comments
Correct Answer: A. 78°C

Explanation:

The boiling point of a substance is the temperature at which its vapor ... Read More Details

3 Physical Chemistry MCQs

The process in which a solid changes directly into vapors without passing through the liquid state is called _______?

  • Decantation
  • Sublimation
  • Evaporation
  • None of these
0 Comments
Correct Answer: B. Sublimation

Explanation:

Sublimation is a physical process in which a substance changes directly from the ... Read More Details

4 Analytical Chemistry MCQs

The pH of milk is approximately ?

  • 9
  • 6.5 – 7
  • 8
  • 12
0 Comments
Correct Answer: B. 6.5 – 7

Explanation:

Milk is a natural colloidal solution composed of water, proteins, lactose (milk sugar), ... Read More Details

5 Analytical Chemistry MCQs

Calculate the percentage of nitrogen (%N) in potassium nitrate (KNO₃):

  • 14.34%
  • 18.56%
  • 13.86%
  • None of these
0 Comments
Correct Answer: C. 13.86%

Explanation:

Potassium nitrate (KNO₃) is a common inorganic salt widely used in fertilizers, food ... Read More Details

6 Physical Chemistry MCQs

Elements that have the same number of neutrons are called ?

  • Isotopes
  • Isobars
  • Isotones
  • None of these
0 Comments
Correct Answer: C. Isotones

Explanation:

Atoms are characterized by three main numbers: the atomic number (Z), the mass ... Read More Details

7 Analytical Chemistry MCQs

Who introduced the term “Concentration Window” to draw arbitrary lines of demarcation?

  • Einstein
  • Dr. A. Walash
  • Schwartz
  • S. E. Manhan
0 Comments
Correct Answer: C. Schwartz

Explanation:

The term “Concentration Window” was introduced by Schwartz in the field of analytical ... Read More Details

8 Environmental Chemistry MCQs

Which one of the following serves as an aquatic solar fuel cell?

  • Bacteria
  • Virus
  • Fungi
  • Algae
0 Comments
Correct Answer: D. Algae

Explanation:

Algae are often described as aquatic solar fuel cells because of their ability ... Read More Details

9 Environmental Chemistry MCQs

How much of the solar energy absorbed by the Earth’s surface is used to drive the hydrologic (water) cycle?

  • 1/2
  • 1/3
  • 1/4
  • 1/5
0 Comments
Correct Answer: B. 1/3

Explanation:

The Earth continuously receives energy from the Sun, and this solar energy drives ... Read More Details

10 Organic Chemistry MCQs

Polyamides are synthetic polymers that are commonly known as ?

  • Synthetic
  • Protein
  • Cellulose
  • Nylon
0 Comments
Correct Answer: D. Nylon

Explanation:

Polyamides are a class of synthetic polymers characterized by the presence of repeating ... Read More Details

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