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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

Soda lime is a mixture of which of the following?

  • CaO and KOH
  • CaO and NaOH
  • NaOH and Na₂O
  • Na₂O and KOH
0 Comments
Correct Answer: B. CaO and NaOH

Explanation:

Soda lime is an important chemical mixture composed primarily of calcium oxide (CaO) ... Read More Details

2 Organic Chemistry MCQs

What is formed when ethyl tetrahalide undergoes dehalogenation?

  • Ethene
  • Ethyne
  • Ethyl halide
  • All of the above are possible
0 Comments
Correct Answer: B. Ethyne

Explanation:

When ethyl tetrahalide (C₂H₂X₄) undergoes dehalogenation, the product formed is ethyne (C₂H₂), also ... Read More Details

3 Organic Chemistry MCQs

Alkanes are gases up to how many carbon atoms?

  • 2
  • 3
  • 4
  • 6
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Correct Answer: C. 4

Explanation:

Alkanes are the simplest saturated hydrocarbons, consisting of carbon and hydrogen atoms connected ... Read More Details

4 Organic Chemistry MCQs

What is formed during the incomplete oxidation of methane in a limited supply of air?

  • CO₂ and H₂O
  • CH₃OH
  • CO + H₂ + C
  • CO + H₂O + C
0 Comments
Correct Answer: B. CH₃OH

Explanation:

When methane (CH₄) undergoes oxidation, the product formed depends on the amount of ... Read More Details

5 Organic Chemistry MCQs

What is the order of ease of halogenation in alkanes?

  • I₂ > Cl₂ > Br₂ > F₂
  • F₂ > Cl₂ > I₂ > Br₂
  • F₂ > Cl₂ > Br₂ > I₂
  • Cl₂ > F₂ > Br₂ > I₂
0 Comments
Correct Answer: C. F₂ > Cl₂ > Br₂ > I₂

Explanation:

The order of ease of halogenation in alkanes follows the trend F₂ > ... Read More Details

6 Organic Chemistry MCQs

What is the general formula of alkynes?

  • CₙH₂ₙ₊₂
  • CₙH₂ₙ₋₂
  • CₙH₂ₙ
  • CₙH₂ₙ₊₁
0 Comments
Correct Answer: B. CₙH₂ₙ₋₂

Explanation:

Alkynes are unsaturated hydrocarbons that contain at least one carbon–carbon triple bond (–C≡C–) ... Read More Details

7 Organic Chemistry MCQs

What is the removal of a halogen and a hydrogen atom from a molecule called?

  • Halogenation
  • Dehalogenation
  • Dehydrohalogenation
  • Hydrohalogenation
0 Comments
Correct Answer: C. Dehydrohalogenation

Explanation:

In organic chemistry, the removal of a hydrogen atom and a halogen atom ... Read More Details

8 Chemistry MCQs

Which of the following is the lightest substance?

  • Uranium
  • Hydrogen
  • Oxygen
  • Nitrogen
0 Comments
Correct Answer: B. Hydrogen

Explanation:

Hydrogen is universally recognized as the lightest substance and the simplest element in ... Read More Details

9 Chemistry MCQs

Which metal is used for galvanizing iron?

  • Aluminium
  • Copper
  • Zinc
  • Lead
0 Comments
Correct Answer: C. Zinc

Explanation:

The metal used for galvanizing iron is zinc. Galvanization is a process in ... Read More Details

10 Chemistry MCQs

What happens to the boiling point of water when sugar is added?

  • It increases
  • It decreases
  • It remains unchanged
  • None of the above
0 Comments
Correct Answer: A. It increases

Explanation:

When sugar is added to water, the boiling point of water increases. This ... Read More Details

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