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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

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

2 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

3 Organic Chemistry MCQs

What is the valency of a carbon atom?

  • 1
  • 2
  • 3
  • 4
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Correct Answer: D. 4

Explanation:

The concept of valency refers to the combining capacity of an atom, which ... Read More Details

4 Inorganic Chemistry MCQs

What is the chemical formula of Zinc Hydroxide?

  • Zn(OH)₂
  • ZnO₂
  • Zn₂(OH)₃
  • ZnOH
0 Comments
Correct Answer: A. Zn(OH)₂

Explanation:

Zinc hydroxide is an inorganic compound formed when zinc ions (Zn²⁺) combine with ... Read More Details

5 Environmental Chemistry MCQs

Permanent hardness of water, caused by the sulphates of metals, can be removed by using ________?

  • Zeolites
  • Sulphonides
  • Lime
  • Nitrates
0 Comments
Correct Answer: A. Zeolites

Explanation:

Water hardness is caused by the presence of dissolved salts of calcium and ... Read More Details

6 Inorganic Chemistry MCQs

Which of the following is not a property of an ionic bond?

  • Sharing of electrons
  • Transfer of electrons
  • Losing of electrons
  • Gaining of electrons
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Correct Answer: A. Sharing of electrons

Explanation:

An ionic bond is a type of chemical bond formed when one atom ... Read More Details

7 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

8 Inorganic Chemistry MCQs

What is the molecular weight of Ammonia (NH₃)?

  • 17.031 g/mol
  • 18.031 g/mol
  • 19.031 g/mol
  • 27.033 g/mol
0 Comments
Correct Answer: A. 17.031 g/mol

Explanation:

Ammonia (NH₃) is a simple nitrogen-containing compound widely used in fertilizers, cleaning products, ... Read More Details

9 Inorganic Chemistry MCQs

The absolute value of charge on an electron was determined by __________?

  • J.J. Thomson
  • Chadwick
  • Rutherford
  • Robert Millikan
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Correct Answer: D. Robert Millikan

Explanation:

The absolute charge of an electron was determined by Robert Millikan through his ... Read More Details

10 Inorganic Chemistry MCQs

The discovery of the neutron was delayed because __________?

  • It does not carry any charge
  • It does not move
  • It is a fundamental particle
  • It is present in the nucleus
0 Comments
Correct Answer: A. It does not carry any charge

Explanation:

The neutron is a subatomic particle found in the nucleus of an atom ... Read More Details

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