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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

By which method was the molecular mass of benzene determined as 78.108?

  • Specific gravity method
  • Vapour density method
  • X-ray diffraction method
  • Distillation method
0 Comments
Correct Answer: B. Vapour density method

Explanation:

The molecular mass of benzene (C₆H₆), determined as 78.108 g/mol, was obtained using ... Read More Details

2 Physical Chemistry MCQs

If the temperature of gallium arsenide (GaAs) is increased, its electrical conductivity will ?

  • Decrease
  • Increase
  • Remain constant
  • First decrease then increase
0 Comments
Correct Answer: B. Increase

Explanation:

Gallium arsenide (GaAs) is a semiconductor compound formed from gallium (Ga) and arsenic ... Read More Details

3 Physical Chemistry MCQs

Water gas at 450 °C and 200 atm with ZnO + Cr₂O₃ catalyst gives which product?

  • Methanol
  • Ethanol
  • Carbonic acid
  • Methane
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Correct Answer: A. Methanol

Explanation:

Water gas is a mixture of carbon monoxide (CO) and hydrogen (H₂) obtained ... Read More Details

4 Physical Chemistry MCQs

What is the easiest way to balance a chemical equation?

  • By using the atom’s atomic number
  • By using the atom’s atomic mass
  • First balance the metal, then the non-metal, then hydrogen, and finally oxygen
  • None of the above
0 Comments
Correct Answer: C. First balance the metal, then the non-metal, then hydrogen, and finally oxygen

Explanation:

Balancing chemical equations is an essential skill in chemistry. It ensures that the ... Read More Details

5 Physical Chemistry MCQs

Equal volumes of gases at the same temperature and pressure contain equal number of molecules. Which law?

  • Boyle’s Law
  • Charles’ Law
  • Gay-Lussac’s Law
  • Avogadro’s Law
0 Comments
Correct Answer: D. Avogadro’s Law

Explanation:

The correct answer is Avogadro’s Law. This fundamental gas law explains that equal ... Read More Details

6 Physical Chemistry MCQs

At constant pressure, gas volume is directly proportional to Kelvin temperature. Which law?

  • Charles’ Law
  • Avogadro’s Law
  • Graham’s Law
  • Boyle’s Law
0 Comments
Correct Answer: A. Charles’ Law

Explanation:

The correct answer is Charles’ Law. This law describes the direct relationship between ... Read More Details

7 Physical Chemistry MCQs

Which law states that the rate of effusion of a gas is inversely proportional to the square root of its density?

  • Graham’s Law
  • Gay-Lussac’s Law
  • Boyle’s Law
  • None of these
0 Comments
Correct Answer: A. Graham’s Law

Explanation:

Graham’s Law of Effusion is a fundamental principle in physical chemistry that explains ... Read More Details

8 Physical Chemistry MCQs

The sum of protons and neutrons in an atom gives which number?

  • Nucleon number
  • Mass number
  • Atomic number
  • Both A and B
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Correct Answer: D. Both A and B

Explanation:

Atoms are made of protons, neutrons, and electrons. Protons and neutrons are located ... Read More Details

9 Physical Chemistry MCQs

The reciprocal of the coefficient of viscosity is called __________?

  • Density
  • Specific gravity
  • Fluidity
  • Absorbance
0 Comments
Correct Answer: C. Fluidity

Explanation:

In physical chemistry, the viscosity of a fluid measures its resistance to flow. ... Read More Details

10 Physical Chemistry MCQs

If the volume of a gas triples at constant temperature, what happens to its pressure?

  • 3P
  • P ÷ 3
  • 3P ÷ T
  • 6P
0 Comments
Correct Answer: B. P ÷ 3

Explanation:

According to Boyle’s Law, the pressure of a fixed mass of gas at ... Read More Details

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