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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

What is the chemical name of pure limestone?

  • Aluminum Oxide
  • Calcium Carbonate
  • Calcium Sulphate
  • None of these
0 Comments
Correct Answer: B. Calcium Carbonate

Explanation:

Limestone is one of the most abundant and important sedimentary rocks on Earth. ... Read More Details

2 Chemistry MCQs

1 Carat is equal to ?

  • 0.2 g
  • 0.3 g
  • 0.4 g
  • 0.5 g
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Correct Answer: A. 0.2 g

Explanation:

The carat is a unit of mass that is widely used for measuring ... Read More Details

3 Chemistry MCQs

Metals are highly ?

  • Electropositive
  • Electronegativity
  • Both of these
  • Neutral
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Correct Answer: A. Electropositive

Explanation:

Metals are chemical elements characterized by their ability to conduct heat and electricity, ... Read More Details

4 Organic Chemistry MCQs

Formaldehyde on condensation in the presence of calcium hydroxide gives:

  • Formose
  • Fructose
  • Maltose
  • Xylose
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Correct Answer: A. Formose

Explanation:

Formaldehyde (CH₂O) is the simplest aldehyde in organic chemistry. When formaldehyde undergoes condensation ... Read More Details

5 Physical Chemistry MCQs

The fundamental ways to transfer energy are:

  • Pressure and temperature
  • Pressure and volume
  • Heat and volume
  • Heat and work
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Correct Answer: D. Heat and work

Explanation:

Energy transfer is a key concept in physical chemistry and thermodynamics. There are ... Read More Details

6 Environmental Chemistry MCQs

The main contributor to the toxicity of detergent is:

  • Na-Silicate solution
  • Na-Sulphate solution
  • Na-Chloride solution
  • K-Chloride solution
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Correct Answer: A. Na-Silicate solution

Explanation:

Detergents are widely used for cleaning clothes, dishes, and other surfaces. However, they ... Read More Details

7 Inorganic Chemistry MCQs

The usual property of ionic crystals is:

  • Stable
  • Gaseous form
  • Unstable
  • Compound forming
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Correct Answer: D. Compound forming

Explanation:

Ionic crystals are solid structures formed by the electrostatic attraction between positively charged ... Read More Details

8 Analytical Chemistry MCQs

The distribution coefficient is related to:

  • Separating factors
  • Decreasing factors
  • Colouring factors
  • Retardation factors
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Correct Answer: A. Separating factors

Explanation:

The distribution coefficient is an important concept in analytical chemistry, particularly in solvent ... Read More Details

9 Environmental Chemistry MCQs

Which parameter measures organic pollution in water?

  • COD
  • DO
  • pH
  • Salinity
0 Comments
Correct Answer: A. COD

Explanation:

Organic pollution in water happens when organic substances like sewage, food waste, or ... Read More Details

10 Environmental Chemistry MCQs

The medium which interacts with long-lived pollutants is:

  • Source
  • Receptor
  • Sink
  • All of them
0 Comments
Correct Answer: C. Sink

Explanation:

Long-lived pollutants are substances that remain in the environment for many years without ... Read More Details

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