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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 Inorganic Chemistry MCQs

Sulphur dioxide (SO₂) reacts with chlorine (Cl₂) in sunlight to form:

  • Sulphur dioxide
  • Sulphuryl chloride
  • Sulphanyl chloride
  • All of the above
0 Comments
Correct Answer: B. Sulphuryl chloride

Explanation:

Sulphur dioxide (SO₂) is an acidic oxide of sulfur, while chlorine (Cl₂) is ... Read More Details

2 Inorganic Chemistry MCQs

In which compound is the oxidation state of phosphorus +1?

  • H₃PO₃
  • H₃PO₄
  • H₃PO₂
  • H₂P₂O₇
0 Comments
Correct Answer: C. H₃PO₂

Explanation:

Oxidation states help us understand electron distribution in compounds. In phosphorus oxoacids, phosphorus ... Read More Details

3 Chemistry MCQs

The filament of an electric bulb is made of:

  • Copper
  • Aluminum
  • Lead
  • Tungsten
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Correct Answer: D. Tungsten

Explanation:

The filament in an electric bulb is the part that produces light when ... Read More Details

4 Organic Chemistry MCQs

Tetraethyl lead is used as:

  • Pain killer
  • Fire extinguisher
  • Mosquito repellent
  • Petrol additive
0 Comments
Correct Answer: D. Petrol additive

Explanation:

Tetraethyl lead (TEL) is an organometallic compound with the chemical formula (C₂H₅)₄Pb. It ... Read More Details

5 Chemistry MCQs

What is the average salinity of seawater?

  • 3%
  • 3.5%
  • 2.5%
  • 2%
0 Comments
Correct Answer: B. 3.5%

Explanation:

Seawater contains a variety of dissolved salts, minerals, and ions, giving it a ... Read More Details

6 Organic Chemistry MCQs

The chemical Ethyl Mercaptan, added to LPG cooking gas to give it a detectable smell, is a compound of:

  • Bromine
  • Fluorine
  • Chlorine
  • Sulphur
0 Comments
Correct Answer: D. Sulphur

Explanation:

Ethyl Mercaptan, also known as ethanethiol (C₂H₅SH), is a chemical compound that contains ... Read More Details

7 Organic Chemistry MCQs

What is Marsh Gas?

  • Nitrogen
  • Ethane
  • Methane
  • Hydrogen
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Correct Answer: C. Methane

Explanation:

Marsh gas is the common name for methane (CH₄), which is the simplest ... Read More Details

8 Inorganic Chemistry MCQs

Why is Potassium Permanganate (KMnO₄) used to purify drinking water?

  • It is a sterilising agent
  • It dissolves the impurities of water
  • It is a reducing agent
  • It is an oxidising agent
0 Comments
Correct Answer: D. It is an oxidising agent

Explanation:

Potassium Permanganate (KMnO₄) is a dark purple inorganic compound commonly used in water ... Read More Details

9 Analytical Chemistry MCQs

What is the pH of a 0.001 M solution of Nitric Acid (HNO₃)?

  • 2
  • 3
  • 4
  • 5
0 Comments
Correct Answer: B. 3

Explanation:

Nitric acid (HNO₃) is a strong acid, which means it completely ionizes in ... Read More Details

10 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

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