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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

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

2 Physical Chemistry MCQs

What is the density of Argon gas at 30 °C temperature and 1.05 atm pressure?

  • 1.65 g/L
  • 1.67 g/L
  • 1.68 g/L
  • None of the above
0 Comments
Correct Answer: C. 1.68 g/L

Explanation:

The density of a gas can be determined using the ideal gas law, ... Read More Details

3 Physical Chemistry MCQs

Which set of quantum numbers is not allowed according to the rules of quantum mechanics?

  • n = 2, l = 1, mₗ = 0, mₛ = +½
  • n = 2, l = 1, mₗ = -1, mₛ = +½
  • n = 2, l = 0, mₗ = 0, mₛ = -½
  • n = 2, l = 2, mₗ = 1, mₛ = -½
0 Comments
Correct Answer: D. n = 2, l = 2, mₗ = 1, mₛ = -½

Explanation:

Quantum numbers define the properties of electrons in an atom according to quantum ... Read More Details

4 Physical Chemistry MCQs

A 10-volume solution of H₂O₂ means ?

  • 10 grams of H₂O₂ solution liberate 10 mL of O₂ at STP
  • 10 gram equivalents of H₂O₂ liberate 10 mL of O₂ at STP
  • 10 litres of H₂O₂ liberate 19 mL of O₂ at STP
  • 1 mL of solution of H₂O₂ liberates 10 mL of O₂ at STP
0 Comments
Correct Answer: D. 1 mL of solution of H₂O₂ liberates 10 mL of O₂ at STP

Explanation:

The volume strength of a hydrogen peroxide (H₂O₂) solution is a measure of ... Read More Details

5 Physical Chemistry MCQs

The volume strength of a 1.5 N H₂O₂ solution is __________?

  • 4.8
  • 5.2
  • 8.8
  • 8.4
0 Comments
Correct Answer: D. 8.4

Explanation:

Volume strength is a measure of the oxidizing power of hydrogen peroxide (H₂O₂) ... Read More Details

6 Physical Chemistry MCQs

The structure of hydrogen peroxide (H₂O₂) is __________?

  • Planar
  • Non-polar
  • Spherical
  • Linear
0 Comments
Correct Answer: B. Non-polar

Explanation:

Hydrogen peroxide (H₂O₂) is a simple molecule composed of two hydrogen atoms and ... Read More Details

7 Physical Chemistry MCQs

What is the shape of a water (H₂O) molecule?

  • V-shaped
  • Angular
  • Pyramidal
  • Triangular planar
0 Comments
Correct Answer: A. V-shaped

Explanation:

The water molecule (H₂O) consists of a central oxygen atom bonded to two ... Read More Details

8 Physical Chemistry MCQs

What is the shape of the triiodide ion (I₃⁻)?

  • Trigonal bipyramidal
  • Linear
  • Square bipyramidal
  • Both A and C
0 Comments
Correct Answer: B. Linear

Explanation:

The triiodide ion (I₃⁻) is a polyatomic ion consisting of three iodine atoms. ... Read More Details

9 Physical Chemistry MCQs

The hybrid orbitals of BeCl₂ are of type __________?

  • sp²
  • sp³
  • sp
  • dsp²
0 Comments
Correct Answer: C. sp

Explanation:

Beryllium chloride (BeCl₂) is a linear molecule in which beryllium is bonded to ... Read More Details

10 Physical Chemistry MCQs

Molecular Orbital Theory is also called __________?

  • Bonding Theory
  • Band Theory
  • Antibonding Theory
  • π and σ Bonding Theory
0 Comments
Correct Answer: C. Antibonding Theory

Explanation:

The Molecular Orbital (MO) Theory explains how electrons are distributed in molecules. According ... Read More Details

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