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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

The anhydride of perchloric acid (HClO₄) is ?

  • Cl₂O
  • Cl₂O₆
  • ClO₂
  • Cl₂O₇
0 Comments
Correct Answer: D. Cl₂O₇

Explanation:

Perchloric acid (HClO₄) is a strong oxoacid of chlorine, where chlorine is in ... Read More Details

2 Organic Chemistry MCQs

Alkanes containing a methyl group on the second carbon of the main chain are called ?

  • Iso-alkane
  • Normal-alkane
  • Neo-alkane
  • Branched-alkane
0 Comments
Correct Answer: A. Iso-alkane

Explanation:

Alkanes are hydrocarbons containing only single carbon–carbon bonds and are classified based on ... Read More Details

3 Organic Chemistry MCQs

Alkanes are also known as ?

  • Saturated hydrocarbon
  • Unsaturated hydrocarbon
  • Paraffins
  • Both A & C
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Correct Answer: C. Paraffins

Explanation:

Alkanes are a class of hydrocarbons that contain only single bonds between carbon ... Read More Details

4 Organic Chemistry MCQs

Hydrogenolysis results in the formation of ?

  • Alkane
  • Alkene
  • Alkyne
  • Aldehydes
0 Comments
Correct Answer: A. Alkane

Explanation:

Hydrogenolysis is an organic reaction in which a chemical bond, usually a carbon–heteroatom ... Read More Details

5 Organic Chemistry MCQs

Removal of carbon dioxide (CO₂) from a compound is called ?

  • Carboxylation
  • Decarboxylation
  • Esterification
  • Hydroxylation
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Correct Answer: B. Decarboxylation

Explanation:

Decarboxylation is the process in which a molecule of carbon dioxide (CO₂) is ... Read More Details

6 Organic Chemistry MCQs

Molozonide is unstable and changes into ozonide on __________________?

  • Reduction
  • Oxidation
  • Hydrolysis
  • Rearrangement
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Correct Answer: D. Rearrangement

Explanation:

When ozone reacts with an alkene, the reaction first forms an unstable intermediate ... Read More Details

7 Organic Chemistry MCQs

What is the compound R–Mg–Br called?

  • Grignard reagent
  • Metallic alkyl halide
  • Both A & B
  • Alkyl
0 Comments
Correct Answer: A. Grignard reagent

Explanation:

The compound R–Mg–Br is known as a Grignard reagent. It is an organometallic ... Read More Details

8 Organic Chemistry MCQs

Which of the following is the most reactive hydrocarbon?

  • Ethane
  • Ethyne
  • Ethene
  • Benzene
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Correct Answer: C. Ethene

Explanation:

The reactivity of hydrocarbons depends on the type of bonding between carbon atoms ... Read More Details

9 Organic Chemistry MCQs

Introduction of a nitro group (–NO₂) in a molecule is called ?

  • Nitration
  • Halogenation
  • Sulphonation
  • Amination
0 Comments
Correct Answer: A. Nitration

Explanation:

Nitration is a fundamental chemical reaction in organic chemistry that involves the introduction ... Read More Details

10 Organic Chemistry MCQs

The gas used in the manufacture of urea fertilizer is ?

  • C₂H₆ (Ethane)
  • C₂H₄ (Ethene)
  • C₂H₂ (Ethyne)
  • CH₄ (Methane)
0 Comments
Correct Answer: D. CH₄ (Methane)

Explanation:

Urea fertilizer is one of the most important nitrogen-containing fertilizers used in agriculture. ... Read More Details

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