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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

Which is the correct enzyme sequence in starch fermentation?

  • Diastase → Zymase → Maltase
  • Diastase → Maltase → Zymase
  • Zymase → Maltase → Diastase
  • Maltase → Diastase → Zymase
0 Comments
Correct Answer: B. Diastase → Maltase → Zymase

Explanation:

The fermentation of starch into alcohol is a multi-step biochemical process that involves ... Read More Details

2 Organic Chemistry MCQs

K₂Cr₂O₇/H₂SO₄ generates ____________________?

  • Chromic acid (H₂CrO₄)
  • Chromium trioxide (CrO₃)
  • Nascent oxygen [O]
  • All of these
0 Comments
Correct Answer: D. All of these

Explanation:

When potassium dichromate (K₂Cr₂O₇) is treated with dilute sulfuric acid (H₂SO₄), the acidic ... Read More Details

3 Organic Chemistry MCQs

Which alcohol forms an alkene with acidic potassium dichromate?

  • Primary alcohol
  • Secondary alcohol
  • Tertiary alcohol
  • All of these
0 Comments
Correct Answer: C. Tertiary alcohol

Explanation:

When alcohols are treated with acidic potassium dichromate (K₂Cr₂O₇/H₂SO₄), they undergo oxidation reactions. ... Read More Details

4 Organic Chemistry MCQs

Which compound is also known as carbolic acid?

  • Methanol
  • Phenol
  • Formic acid
  • Acetic acid
0 Comments
Correct Answer: B. Phenol

Explanation:

Carbolic acid is the older common name for phenol (C₆H₅OH), an aromatic organic ... Read More Details

5 Organic Chemistry MCQs

Heating phenol with zinc will yield which compound?

  • Benzene
  • Toluene
  • Cyclohexane
  • Aniline
0 Comments
Correct Answer: A. Benzene

Explanation:

When phenol (C₆H₅OH) is heated strongly with zinc metal, a reduction reaction takes ... Read More Details

6 Organic Chemistry MCQs

Phenol reacts with formaldehyde in a dilute base to form Bakelite. This process is called?

  • Addition polymerization
  • Condensation polymerization
  • Isomerization
  • Hydrogenation
0 Comments
Correct Answer: B. Condensation polymerization

Explanation:

Bakelite is a synthetic plastic formed when phenol reacts with formaldehyde in the ... Read More Details

7 Organic Chemistry MCQs

Ethanol can be converted into ethanoic acid by which chemical process?

  • Reduction
  • Oxidation
  • Neutralization
  • Hydrogenation
0 Comments
Correct Answer: B. Oxidation

Explanation:

The conversion of ethanol (C₂H₅OH) into ethanoic acid (CH₃COOH) is a classic example ... Read More Details

8 Organic Chemistry MCQs

Methanol can be obtained from?

  • Water gas
  • Destructive distillation of wood
  • Methane
  • All
0 Comments
Correct Answer: D. All

Explanation:

Methanol (CH₃OH) is the simplest alcohol and an important industrial chemical. It can ... Read More Details

9 Organic Chemistry MCQs

Absolute alcohol is obtained when rectified spirit is treated with?

  • Ca(OH)₂
  • CaCO₃
  • CaCl₂
  • CaO
0 Comments
Correct Answer: D. CaO

Explanation:

Rectified spirit is a mixture containing about 95% ethanol and 5% water. It ... Read More Details

10 Organic Chemistry MCQs

Phenol was first isolated by Runge from which source?

  • Vegetable oil
  • Coal tar
  • Wood
  • None of these
0 Comments
Correct Answer: B. Coal tar

Explanation:

Phenol (C₆H₅OH) is one of the simplest aromatic alcohols and an important organic ... Read More Details

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