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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 Chemistry MCQs

Which of the following metals is considered non-toxic in nature?

  • Silver
  • Iron
  • Copper
  • Gold
0 Comments
Correct Answer: D. Gold

Explanation:

Metals are widely used in daily life, but their toxicity levels can vary ... Read More Details

2 Chemistry MCQs

Potassium meta-bisulphite is commonly used as a food preservative in which of the following?

  • Squash
  • Tomato Ketchup
  • Fruit Juices
  • Pickles
0 Comments
Correct Answer: C. Fruit Juices

Explanation:

Potassium meta-bisulphite (K₂S₂O₅) is a chemical compound widely used as a food preservative ... Read More Details

3 Chemistry MCQs

Magnetic quantum number specifies ?

  • Size of orbitals
  • Shape of orbitals
  • Orientation of orbitals
  • All of the above
0 Comments
Correct Answer: C. Orientation of orbitals

Explanation:

In quantum mechanics, the arrangement and properties of electrons are described using four ... Read More Details

4 Chemistry MCQs

Azimuthal quantum number defines ___________?

  • e/m ratio of an electron
  • Spin of an electron
  • Angular momentum of an electron
  • Magnetic momentum of an electron
0 Comments
Correct Answer: C. Angular momentum of an electron

Explanation:

In atomic structure, quantum numbers are used to describe the position and behavior ... Read More Details

5 Physical Chemistry MCQs

Which of the following gases shows the most ideal behaviour at 0 °C?

  • H₂
  • CH₄
  • He
  • NH₃
0 Comments
Correct Answer: C. He

Explanation:

The concept of an ideal gas is based on two key assumptions: first, ... Read More Details

6 Physical Chemistry MCQs

In a closed vessel, a gas is heated from 300 K to 600 K. The kinetic energy becomes ?

  • Double
  • Same
  • Half
  • Four times
0 Comments
Correct Answer: A. Double

Explanation:

According to the kinetic theory of gases, the average kinetic energy of gas ... Read More Details

7 Physical Chemistry MCQs

At constant pressure, at what temperature will the volume of a gas become twice its volume at 0 °C?

  • 546 °C
  • 546 K
  • 200 °C
  • 273 K
0 Comments
Correct Answer: B. 546 K

Explanation:

Charles’ Law describes the relationship between the volume of a gas and its ... Read More Details

8 Physical Chemistry MCQs

The density of a gas is 1.964 g dm⁻³ at 273 K and 76 cm Hg. The gas is ?

  • CH₄
  • CO₂
  • C₂H₄
  • Xe
0 Comments
Correct Answer: B. CO₂

Explanation:

The relationship between density, molar mass, and the ideal gas law is a ... Read More Details

9 Organic Chemistry MCQs

Which of the following haloalkanes is hydrolyzed by the SN1 mechanism?

  • CH₃Br
  • CH₃CH₂Br
  • CH₃CH₂CH₂Br
  • (CH₃)₃CBr
0 Comments
Correct Answer: D. (CH₃)₃CBr

Explanation:

The SN1 reaction mechanism (Substitution Nucleophilic Unimolecular) is a two-step process commonly observed ... Read More Details

10 Organic Chemistry MCQs

A hydrocarbon is formed when a Grignard reagent is treated with ?

  • H₂O
  • CH₃OH
  • Both A and B
  • None of the above
0 Comments
Correct Answer: A. H₂O

Explanation:

Grignard reagents (RMgX) are highly reactive organometallic compounds where R is an alkyl ... Read More Details

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