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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

Commercial detergents mainly contain which of the following compounds?

  • RCOON
  • RONa
  • RSNa
  • R–OSO₃Na
0 Comments
Correct Answer: A. RCOON

Explanation:

Detergents are cleansing agents that work by reducing surface tension and emulsifying oils, ... Read More Details

2 Inorganic Chemistry MCQs

Which one of the following compounds is known as caustic potash?

  • NaOH
  • KOH
  • NaCl
  • NaBH₄
0 Comments
Correct Answer: B. KOH

Explanation:

Caustic potash is the common name for potassium hydroxide (KOH), a strong inorganic ... Read More Details

3 Organic Chemistry MCQs

In which of the following compounds is the carbon–carbon bond strength maximum?

  • CH₃–CH₃
  • CH₂=CH₂
  • Benzene
  • Cyclohexane
0 Comments
Correct Answer: A. CH₃–CH₃

Explanation:

The strength of a chemical bond depends on the bond order, orbital overlap, ... Read More Details

4 Organic Chemistry MCQs

Which of the following effects best explains why o-nitrophenol is insoluble in water?

  • Inductive effect
  • Resonance effect
  • Intramolecular hydrogen bonding
  • Isomeric effect
0 Comments
Correct Answer: C. Intramolecular hydrogen bonding

Explanation:

The solubility of organic compounds in water depends largely on their ability to ... Read More Details

5 Organic Chemistry MCQs

Which one of the following compounds is the most acidic?

  • Phenol
  • p-Nitrophenol
  • o-Nitrophenol
  • m-Nitrophenol
0 Comments
Correct Answer: B. p-Nitrophenol

Explanation:

The acidity of phenolic compounds depends on the ability of the molecule to ... Read More Details

6 Organic Chemistry MCQs

When chlorine (Cl) is attached to a benzene ring, it shows which effects?

  • +I and +R effect
  • –I and +R effect
  • +I and –R effect
  • –I and –R effect
0 Comments
Correct Answer: B. –I and +R effect

Explanation:

When a substituent such as chlorine (Cl) is attached to a benzene ring, ... Read More Details

7 Organic Chemistry MCQs

What is the main criterion for a compound to be aromatic?

  • Unsaturations
  • Cyclic structure
  • Presence of 4nπ electrons
  • Presence of 4n+2π electrons
0 Comments
Correct Answer: D. Presence of 4n+2π electrons

Explanation:

Aromatic compounds are a special class of organic molecules that show unusual stability ... Read More Details

8 Chemistry MCQs

The height of the troposphere varies between ________ km.

  • 7 at equator – 17 at poles
  • 17 at equator – 7 at poles
  • 18 at equator – 8 at poles
  • 8 at equator – 18 at poles
0 Comments
Correct Answer: B. 17 at equator – 7 at poles

Explanation:

The troposphere is the lowest layer of Earth’s atmosphere, extending from the surface ... Read More Details

9 Chemistry MCQs

Which layer extends from the top of the troposphere to the bottom of the mesosphere?

  • Thermosphere
  • Ionosphere
  • Stratosphere
  • None of the above
0 Comments
Correct Answer: C. Stratosphere

Explanation:

The stratosphere is the second layer of Earth’s atmosphere, positioned directly above the ... Read More Details

10 Chemistry MCQs

The stratosphere is present at an altitude between ________ km.

  • 15 – 35
  • 17 – 35
  • 18 – 35
  • 19 – 35
0 Comments
Correct Answer: A. 15 – 35

Explanation:

The stratosphere is the second layer of Earth’s atmosphere, situated above the troposphere ... Read More Details

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