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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 Organic Chemistry MCQs

The name formic acid is derived from the Latin word formica (ant) because:

  • It was used to destroy ant-hills
  • It is secreted by ants to defend themselves
  • It was first obtained by distilling ants
  • Ants are attracted to its smell
0 Comments
Correct Answer: C. It was first obtained by distilling ants

Explanation:

Formic acid (HCOOH) is the simplest carboxylic acid and an important compound in ... Read More Details

2 Environmental Chemistry MCQs

Which of the following phenomena is considered responsible for global warming?

  • Greenhouse effect
  • Fire in coal mines
  • Dry farming
  • Monsoon
0 Comments
Correct Answer: A. Greenhouse effect

Explanation:

Global warming refers to the gradual increase in the average temperature of the ... Read More Details

3 Physical Chemistry MCQs

How much heat energy is produced when the human body metabolizes 1 gram of fat?

  • 30 kJ
  • 1 kJ
  • 39 kJ
  • 29 kJ
0 Comments
Correct Answer: C. 39 kJ

Explanation:

The human body produces energy by metabolizing macronutrients such as carbohydrates, proteins, and ... Read More Details

4 Organic Chemistry MCQs

The octane number of zero is assigned to which compound?

  • 2-Methyl octane
  • n-Heptane
  • Iso-octane
  • 3-Methyl octane
0 Comments
Correct Answer: B. n-Heptane

Explanation:

The octane number is a measure of the resistance of a fuel to ... Read More Details

5 Inorganic Chemistry MCQs

What mass of P₄O₁₀ will be formed when 1.33 g of P₄ reacts with 5.07 g of oxygen (O₂)?

  • 2.05 g
  • 3.05 g
  • 4.05 g
  • 5.05 g
0 Comments
Correct Answer: B. 3.05 g

Explanation:

The reaction between phosphorus and oxygen to form phosphorus pentoxide is a classic ... Read More Details

6 Physical Chemistry MCQs

The heat required to raise the temperature of a body by 1 K is called what?

  • Specific heat
  • Thermal capacity
  • Water equivalent
  • None of the above
0 Comments
Correct Answer: B. Thermal capacity

Explanation:

The concept of heat capacity is fundamental in thermodynamics. The heat required to ... Read More Details

7 Inorganic Chemistry MCQs

What is the most commonly used bleaching agent?

  • Alcohol
  • Carbon dioxide
  • Chlorine
  • Sodium chloride
0 Comments
Correct Answer: C. Chlorine

Explanation:

Bleaching agents are substances used to remove color from materials such as fabrics, ... Read More Details

8 Physical Chemistry MCQs

What is the main buffer system of human blood?

  • H₂CO₃ – HCO₃⁻
  • H₂CO₃ – CO₃²⁻
  • CH₃COOH – CH₃COO⁻
  • NH₂CONH₂ – NH₂CONH⁺
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Correct Answer: A. H₂CO₃ – HCO₃⁻

Explanation:

The human body maintains a nearly constant blood pH of about 7.35 to ... Read More Details

9 Physical Chemistry MCQs

Which law states that the amount of gas dissolved in a liquid is directly proportional to its partial pressure?

  • Dalton’s Law
  • Gay-Lussac’s Law
  • Henry’s Law
  • Raoult’s Law
0 Comments
Correct Answer: C. Henry’s Law

Explanation:

The solubility of gases in liquids is an important concept in physical chemistry. ... Read More Details

10 Physical Chemistry MCQs

The molecules of which gas move with the highest average speed?

  • H₂ at –73 °C
  • CH₄ at 300 K
  • N₂ at 1,027 °C
  • O₂ at 0 °C
0 Comments
Correct Answer: A. H₂ at –73 °C

Explanation:

The average speed of gas molecules is explained by the kinetic molecular theory ... Read More Details

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