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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 Environmental Chemistry MCQs

Cyclone collector is used for minimizing:

  • Water pollution
  • Sound pollution
  • Soil pollution
  • Air pollution
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Correct Answer: D. Air pollution

Explanation:

A cyclone collector, also called a cyclone separator, is a device used in ... Read More Details

2 Environmental Chemistry MCQs

Biodegradable pollutant is:

  • DDT
  • Mercury salt
  • Domestic waste
  • Aluminum foil
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Correct Answer: C. Domestic waste

Explanation:

Pollutants are substances that contaminate the environment and can harm living organisms. They ... Read More Details

3 Environmental Chemistry MCQs

Surface water contains:

  • Only salt
  • Organic matter
  • Salt & Organic matter
  • Suspended impurity
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Correct Answer: C. Salt & Organic matter

Explanation:

Surface water is the water present on the Earth’s surface in rivers, lakes, ... Read More Details

4 Environmental Chemistry MCQs

Ozone is formed in the upper atmosphere from oxygen by the action of:

  • Free radicals
  • Cosmic rays
  • Nitrogen oxides
  • UV-rays
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Correct Answer: D. UV-rays

Explanation:

Ozone (O₃) is formed in the stratosphere, the upper layer of the atmosphere. ... Read More Details

5 Analytical Chemistry MCQs

Which of the following pair is not distinguished by passing H₂S?

  • Hg, Pb
  • Zn, Mn
  • As, Cd
  • Cd, Pb
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Correct Answer: A. Hg, Pb

Explanation:

In analytical chemistry, hydrogen sulfide (H₂S) is used to detect and separate metal ... Read More Details

6 Analytical Chemistry MCQs

The most useful dye for fabrics that can form hydrogen bonds is:

  • Mordant dye
  • Vat dye
  • Acid dye
  • Direct dye
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Correct Answer: D. Direct dye

Explanation:

Dyes are substances used to color fabrics. Different dyes work better with different ... Read More Details

7 Analytical Chemistry MCQs

Alum is used by dyers of cloth:

  • As water purifier
  • As mordant
  • Fire proofing fabrics
  • Softening of hard water
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Correct Answer: B. As mordant

Explanation:

Alum is a chemical compound commonly used in dyeing fabrics. A mordant is ... Read More Details

8 Organic Chemistry MCQs

Strong nucleophile in polar aprotic solvent is ?

  • Fluoride ion
  • Bromide ion
  • Chloride ion
  • Iodide ion
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Correct Answer: A. Fluoride ion

Explanation:

The nucleophilicity of ions depends greatly on the type of solvent used. Solvents ... Read More Details

9 Chemistry MCQs

Which paste is used in a lead battery?

  • Manganese dioxide
  • Zinc chloride
  • Ammonium chloride
  • Lead oxide paste
0 Comments
Correct Answer: D. Lead oxide paste

Explanation:

The lead-acid battery, also known as the lead storage battery, is one of ... Read More Details

10 Analytical Chemistry MCQs

Which chemical is used as a fixer in photography?

  • NaHSO₃
  • Na₂S₂O₃
  • Na₂S
  • Na₂SO₃
0 Comments
Correct Answer: B. Na₂S₂O₃

Explanation:

In traditional photography, capturing an image involves several chemical steps. After light exposure ... Read More Details

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