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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 Organic Chemistry MCQs

Methyl alcohol is not used as ____________?

  • A solvent
  • An antifreezing agent
  • A substitute for petrol
  • For denaturing of ethyl alcohol
0 Comments
Correct Answer: C. A substitute for petrol

Explanation:

Methyl alcohol, also known as methanol (CH₃OH), is the simplest aliphatic alcohol. It ... Read More Details

2 Organic Chemistry MCQs

Which alcohol can be prepared by fermentation?

  • CH₃OH (Methanol)
  • C₃H₇OH (Propanol)
  • CH₃–CH₂–OH (Ethanol)
  • C₆H₅OH (Phenol)
0 Comments
Correct Answer: C. CH₃–CH₂–OH (Ethanol)

Explanation:

Fermentation is one of the oldest biochemical processes used for the preparation of ... Read More Details

3 Organic Chemistry MCQs

When alcohol reacts with phosphorus halides, it gives _____________?

  • Alkyl halides
  • Alkyl amines
  • Alkanes
  • Alkynes
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Correct Answer: A. Alkyl halides

Explanation:

Alcohols undergo substitution reactions with phosphorus halides to form alkyl halides. The hydroxyl ... Read More Details

4 Organic Chemistry MCQs

Which one of the following compounds does not contain an –OH group?

  • Ethylene glycol
  • Glycerol
  • Picric acid
  • Ethyl acetate
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Correct Answer: D. Ethyl acetate

Explanation:

The hydroxyl group (–OH) is the functional group present in alcohols and phenols. ... Read More Details

5 Organic Chemistry MCQs

Ethers show functional group isomerism with which compound?

  • Aldehydes
  • Ketones
  • Alcohols
  • Carboxylic acids
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Correct Answer: C. Alcohols

Explanation:

Ethers are organic compounds that have the general formula R–O–R′, where two alkyl ... Read More Details

6 Organic Chemistry MCQs

Which compound is also called lactic acid?

  • 3-Hydroxypropanoic acid
  • 2-Hydroxypropanoic acid
  • 2-Hydroxybutanoic acid
  • 3-Hydroxybutanoic acid
0 Comments
Correct Answer: B. 2-Hydroxypropanoic acid

Explanation:

Lactic acid is the common name for 2-hydroxypropanoic acid, an organic compound with ... Read More Details

7 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

8 Inorganic Chemistry MCQs

Which of the following noble gases is not normally present in the atmosphere?

  • Argon
  • Helium
  • Radon
  • Xenon
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Correct Answer: C. Radon

Explanation:

The correct answer is Radon. Unlike other noble gases such as argon, helium, ... Read More Details

9 Inorganic Chemistry MCQs

Which of the following noble gases is most abundant in air?

  • Neon
  • Helium
  • Argon
  • Methane
0 Comments
Correct Answer: C. Argon

Explanation:

The correct answer is Argon. Among the noble gases, Argon is the most ... Read More Details

10 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

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