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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 Inorganic Chemistry MCQs

What is the chemical formula of Carnallite?

  • KCl
  • KCl·MgCl₂·6H₂O
  • Na₂B₄O₇·10H₂O
  • CaCO₃·MgCO₃
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Correct Answer: B. KCl·MgCl₂·6H₂O

Explanation:

Carnallite is a hydrated potassium magnesium chloride mineral with the chemical formula KCl·MgCl₂·6H₂O. ... Read More Details

2 Inorganic Chemistry MCQs

During the electrolysis of a dilute solution of NaCl, what is produced at the anode?

  • Sodium
  • Hydrogen
  • Chlorine
  • Oxygen
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Correct Answer: C. Chlorine

Explanation:

Electrolysis is the process of using an electric current to drive a non-spontaneous ... Read More Details

3 Inorganic Chemistry MCQs

Which of the following ions has the highest heat of hydration?

  • Al³⁺
  • Cs⁺
  • Ba²⁺
  • Mg²⁺
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Correct Answer: A. Al³⁺

Explanation:

Heat of hydration is the amount of energy released when ions are surrounded ... Read More Details

4 Inorganic Chemistry MCQs

Which of the following compounds is natron?

  • Na₂CO₃
  • Na₂CO₃·10H₂O
  • Na₂CO₃·H₂O
  • NaHCO₃
0 Comments
Correct Answer: C. Na₂CO₃·H₂O

Explanation:

Natron is a naturally occurring hydrated sodium carbonate. Its chemical formula is Na₂CO₃·H₂O, ... Read More Details

5 Inorganic Chemistry MCQs

Which hydroxide is least ionic in nature and tends to decompose when heated?

  • LiOH
  • NaOH
  • KOH
  • CsOH
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Correct Answer: A. LiOH

Explanation:

Alkali metal hydroxides are ionic compounds consisting of metal cations and hydroxide anions. ... Read More Details

6 Chemistry MCQs

Which is the heaviest naturally occurring element?

  • Radium
  • Platinum
  • Uranium
  • Cadmium
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Correct Answer: C. Uranium

Explanation:

The heaviest naturally occurring element on Earth is Uranium (U). It has an ... Read More Details

7 Chemistry MCQs

Which is the heaviest man-made element discovered so far?

  • Promethium
  • Ununoctium (Oganesson)
  • Francium
  • Technetium
0 Comments
Correct Answer: B. Ununoctium (Oganesson)

Explanation:

The heaviest man-made element discovered so far is Oganesson (Og), which was formerly ... Read More Details

8 Chemistry MCQs

Which of the following is a strong-smelling agent added to LPG cylinders to help detect gas leakage?

  • Nitrogen Peroxide
  • Ethyl Mercaptan
  • Carbon Monoxide
  • Sulphur Dioxide
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Correct Answer: B. Ethyl Mercaptan

Explanation:

Liquefied Petroleum Gas (LPG) is widely used as a fuel for domestic, commercial, ... Read More Details

9 Chemistry MCQs

Which is the lightest metal?

  • Lithium
  • Sodium
  • Magnesium
  • Aluminium
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Correct Answer: A. Lithium

Explanation:

The lightest metal known is lithium (Li). It is the first metal in ... Read More Details

10 Chemistry MCQs

A colloidal system in which a liquid is dispersed in another liquid is called:

  • Precipitate
  • Gel
  • Emulsion
  • Sol
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Correct Answer: C. Emulsion

Explanation:

A colloidal system is a mixture in which one substance is evenly dispersed ... Read More Details

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