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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

Which of the following is not an alkali metal?

  • Francium
  • Caesium
  • Rubidium
  • Radium
0 Comments
Correct Answer: D. Radium

Explanation:

Alkali metals belong to Group 1 of the periodic table and include lithium ... Read More Details

2 Inorganic Chemistry MCQs

The element cesium (Cs) bears chemical resemblance with:

  • Calcium (Ca)
  • Chromium (Cr)
  • Both of the above
  • None of the above
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Correct Answer: D. None of the above

Explanation:

Cesium (Cs) is an alkali metal belonging to Group 1 of the periodic ... Read More Details

3 Inorganic Chemistry MCQs

The Downs cell is used to prepare:

  • Sodium carbonate
  • Sodium bicarbonate
  • Sodium metal
  • Sodium hydroxide
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Correct Answer: C. Sodium metal

Explanation:

The Downs cell is an electrolytic cell used for the industrial production of ... Read More Details

4 Inorganic Chemistry MCQs

Ammonia gas can be prepared by heating ammonium chloride (NH₄Cl) with:

  • Water
  • NaCl
  • Aqueous sodium hydroxide (NaOH)
  • H₂SO₄
0 Comments
Correct Answer: C. Aqueous sodium hydroxide (NaOH)

Explanation:

Ammonia (NH₃) is a colorless gas with a pungent smell and is widely ... Read More Details

5 Inorganic Chemistry MCQs

When crystals of Na₂CO₃·10H₂O (sodium carbonate decahydrate) are exposed to air, they:

  • Lose water and remain solid
  • Gain water and remain solid
  • Gain water and become liquid
  • Remain unchanged
0 Comments
Correct Answer: A. Lose water and remain solid

Explanation:

Sodium carbonate decahydrate (Na₂CO₃·10H₂O) is a hydrated salt containing ten molecules of water ... Read More Details

6 Inorganic Chemistry MCQs

Which compound gives a white precipitate with BaCl₂?

  • NaHCO
  • NaNO₃
  • Na₂CO₃
  • Na₂CrO₄
0 Comments
Correct Answer: C. Na₂CO₃

Explanation:

When Na₂CO₃ (sodium carbonate) is added to an aqueous solution of BaCl₂ (barium ... Read More Details

7 Inorganic Chemistry MCQs

Deliquescence is a property of a solid in which it:

  • Absorbs moisture and remains solid
  • Absorbs moisture and turns into liquid
  • Loses water of crystallization
  • Increases the number of water molecules in its crystal
0 Comments
Correct Answer: B. Absorbs moisture and turns into liquid

Explanation:

Deliquescence is a property of certain solids in which the substance absorbs moisture ... Read More Details

8 Inorganic Chemistry MCQs

In a diaphragm cell, why is the level of brine in the anode compartment kept slightly higher?

  • To prevent hydroxide ions (OH⁻) from reaching the anode
  • To prevent chlorine gas from mixing
  • To prevent cathode decay
  • All of the above
0 Comments
Correct Answer: A. To prevent hydroxide ions (OH⁻) from reaching the anode

Explanation:

A diaphragm cell is an electrolytic cell used in the chlor-alkali process to ... Read More Details

9 Inorganic Chemistry MCQs

Why is the first ionization potential of alkaline earth metals greater than that of alkali metals?

  • They are more reactive
  • They have smaller atomic sizes
  • They have greater atomic radii
  • All of the above
0 Comments
Correct Answer: B. They have smaller atomic sizes

Explanation:

The first ionization potential (IP) is the energy required to remove the outermost ... Read More Details

10 Inorganic Chemistry MCQs

Why is NaOH called caustic soda?

  • It corrodes organic tissues
  • It is used in soda water
  • It reacts with chlorine gas
  • It reacts with fats to form soap
0 Comments
Correct Answer: A. It corrodes organic tissues

Explanation:

Sodium hydroxide (NaOH) is commonly called caustic soda because of its highly corrosive ... Read More Details

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