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Physical Chemistry MCQs

Prepare thoroughly for exams with our carefully structured Physical Chemistry MCQs, designed for chemistry students and aspirants of science-related job tests. These multiple-choice questions cover important topics such as thermodynamics, chemical kinetics, atomic structure, gas laws, quantum chemistry, equilibrium, colligative properties, electrochemistry, phase rule, and thermochemistry. These questions are frequently included in tests conducted by PPSC, FPSC, CSS, NTS, SPSC, BPSC, KPSC, ETEA, AJKPSC, and are highly relevant for Lecturer Chemistry, lab analyst posts, and university-level exams (BSc, MSc Chemistry).

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1 Physical Chemistry MCQs

Which of the following mixtures can be separated by the sublimation method?

  • Sand and Iron filings
  • Sand and Naphthalene
  • Both A & B
  • None of these
0 Comments
Correct Answer: B. Sand and Naphthalene

Explanation:

Sublimation is a separation technique based on the physical property of certain solids ... Read More Details

2 Physical Chemistry MCQs

Why do we determine the boiling point of a liquid?

  • To check its acidity and basicity
  • To check temperature
  • To check its purity and nature
  • None of these
0 Comments
Correct Answer: C. To check its purity and nature

Explanation:

Determining the boiling point of a liquid is one of the most fundamental ... Read More Details

3 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

4 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

5 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

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 Physical Chemistry MCQs

Law of mass action was proposed by Goldberg and Peter Waage in ?

  • 1819
  • 1864
  • 1882
  • 1905
0 Comments
Correct Answer: B. 1864

Explanation:

The Law of Mass Action is one of the most important principles in ... Read More Details

8 Physical Chemistry MCQs

The decomposition of nitroglycerine is an example of:

  • Self-catalytic reaction
  • Enzyme-catalytic reaction
  • Autocatalytic reaction
  • Induced catalysis
0 Comments
Correct Answer: C. Autocatalytic reaction

Explanation:

The decomposition of nitroglycerine (C₃H₅N₃O₉) is a classic example of an autocatalytic reaction. ... Read More Details

9 Physical Chemistry MCQs

The phenomenon of negative catalysis is also known as:

  • Auto catalysis
  • Self catalysis
  • Inhibition
  • Enzyme catalysis
0 Comments
Correct Answer: C. Inhibition

Explanation:

In chemical kinetics, a catalyst is a substance that increases the speed of ... Read More Details

10 Physical Chemistry MCQs

Ostwald’s dilution law is applicable to:

  • All electrolytes
  • Strong electrolytes
  • Non-electrolytes
  • Weak electrolytes
0 Comments
Correct Answer: D. Weak electrolytes

Explanation:

Ostwald’s dilution law explains the relationship between the dissociation constant (Ka or Kb), ... Read More Details

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