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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 Physical Chemistry MCQs

Viscosity of a liquid ________ by increasing temperature?

  • Remains same
  • Increases
  • Decreases
  • None
0 Comments
Correct Answer: C. Decreases

Explanation:

Viscosity is the measure of a fluid’s internal resistance to flow. In liquids, ... Read More Details

2 Physical Chemistry MCQs

Which instrument is used to measure the viscosity?

  • Hygrometer
  • Hydrometer
  • Anemometer
  • Viscometer
0 Comments
Correct Answer: D. Viscometer

Explanation:

Viscosity is a measure of a fluid's resistance to flow. It depends on ... Read More Details

3 Physical Chemistry MCQs

Hydrogen bonding is present in:

  • Water
  • Ethyl Alcohol
  • Phenol
  • All of these
0 Comments
Correct Answer: D. All of these

Explanation:

Hydrogen bonding is a type of strong dipole-dipole interaction that occurs when a ... Read More Details

4 Organic Chemistry MCQs

Acetaldehyde cannot show:

  • Iodoform test
  • Lucas test
  • Benedict’s test
  • Tollen’s test
0 Comments
Correct Answer: B. Lucas test

Explanation:

Acetaldehyde (CH₃CHO) is a simple aliphatic aldehyde. Its chemical behavior can be identified ... Read More Details

5 Organic Chemistry MCQs

The Clemmensen reduction of acetone yields:

  • Ethanol
  • Ethanal
  • Propane
  • Propanol
0 Comments
Correct Answer: C. Propane

Explanation:

Clemmensen reduction is a chemical reaction used to reduce carbonyl groups of aldehydes ... Read More Details

6 Organic Chemistry MCQs

O₃ reacts with CH₂=CH₂ to form ozonide. On hydrolysis it forms:

  • Ethylene oxide
  • HCHO
  • Ethylene glycol
  • Ethyl alcohol
0 Comments
Correct Answer: B. HCHO

Explanation:

Ozonolysis is a reaction in which ozone (O₃) reacts with alkenes to break ... Read More Details

7 Organic Chemistry MCQs

Dimethyl ketones are usually characterized through _____________?

  • Tollen’s reagent
  • Iodoform test
  • Schiff’s test
  • Benedict’s reagent
0 Comments
Correct Answer: B. Iodoform test

Explanation:

Dimethyl ketone, also known as acetone, is the simplest ketone with the formula ... Read More Details

8 Organic Chemistry MCQs

Silver mirror is a test for ____________?

  • Aldehydes
  • Thio alcohols
  • Amines
  • Ethers
0 Comments
Correct Answer: A. Aldehydes

Explanation:

The silver mirror test is a classical chemical reaction used to detect the ... Read More Details

9 Organic Chemistry MCQs

Which of the following is the typical reaction of aldehyde?

  • Electrophilic addition
  • Nucleophilic substitution
  • Nucleophilic addition
  • Nucleophilic elimination
0 Comments
Correct Answer: C. Nucleophilic addition

Explanation:

Aldehydes are organic compounds characterized by the presence of a carbonyl group (C=O) ... Read More Details

10 Organic Chemistry MCQs

Fehling solution reacts with HCHO to form precipitate of _____________?

  • White colour
  • Yellow colour
  • Red colour
  • Blue colour
0 Comments
Correct Answer: C. Red colour

Explanation:

Fehling's solution is a chemical reagent used to detect the presence of reducing ... Read More Details

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