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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

Aluminium is used __________ because it reacts with oxygen and nitrogen.

  • As a nitrometer
  • To remove air bubbles from molten metal
  • To make alloys
  • As an insulator
0 Comments
Correct Answer: B. To remove air bubbles from molten metal

Explanation:

Aluminium (Al) is a highly reactive metal that forms a protective oxide layer ... Read More Details

2 Organic Chemistry MCQs

Silicon differs from silica by a group of ?

  • CH₃
  • OH
  • OCH₃
  • O₂
0 Comments
Correct Answer: B. OH

Explanation:

Silicon (Si) and silica (SiO₂) are chemically related but structurally distinct substances. The ... Read More Details

3 Inorganic Chemistry MCQs

Boron is a non-metal, while the other elements of Group IIIA (Group 13) are metals. This is because ?

  • It has a small atomic size
  • It has a high nuclear charge
  • It forms molecular addition compounds
  • All of the above
0 Comments
Correct Answer: D. All of the above

Explanation:

Boron (B) is the first element of Group 13 (IIIA) in the periodic ... Read More Details

4 Inorganic Chemistry MCQs

The coloured glassy mass formed in the borax bead test is due to the formation of ?

  • Metal borate
  • Metal metaborate
  • Metal boride
  • Metal silicate
0 Comments
Correct Answer: B. Metal metaborate

Explanation:

The borax bead test is a traditional qualitative analysis method used in inorganic ... Read More Details

5 Physical Chemistry MCQs

If the temperature of gallium arsenide (GaAs) is increased, its electrical conductivity will ?

  • Decrease
  • Increase
  • Remain constant
  • First decrease then increase
0 Comments
Correct Answer: B. Increase

Explanation:

Gallium arsenide (GaAs) is a semiconductor compound formed from gallium (Ga) and arsenic ... Read More Details

6 Inorganic Chemistry MCQs

Which of the following compounds decomposes to produce litharge (PbO)?

  • Pb₂O
  • Pb₃O₄
  • PbO₂
  • All of the above
0 Comments
Correct Answer: D. All of the above

Explanation:

Litharge (PbO) is the monoxide of lead, a yellow to reddish crystalline compound ... Read More Details

7 Inorganic Chemistry MCQs

Which of the following compounds is known as metasilicic acid?

  • H₂SnO₃
  • H₂SiO₃
  • H₃AsO₄
  • H₃SbO₄
0 Comments
Correct Answer: B. H₂SiO₃

Explanation:

Metasilicic acid (H₂SiO₃) is one of the hydrated forms of silicic acid, a ... Read More Details

8 Environmental Chemistry MCQs

Boron in soil is considered a micronutrient essential for _____________?

  • Soil porosity
  • Proper growth of plants
  • Alkalinity of soil
  • All of the above
0 Comments
Correct Answer: B. Proper growth of plants

Explanation:

Boron is an essential micronutrient required in very small amounts by plants for ... Read More Details

9 Inorganic Chemistry MCQs

Which substance is found in the dried-up lakes of Tibet and California?

  • Tincal
  • Boric acid
  • Calcium carbonate
  • Colemanite
0 Comments
Correct Answer: A. Tincal

Explanation:

Tincal, commonly known as natural borax, is a hydrated sodium borate mineral with ... Read More Details

10 Inorganic Chemistry MCQs

Which of the following elements does not give the Borax bead test?

  • Cu (Copper)
  • Cr (Chromium)
  • Ni (Nickel)
  • Al (Aluminium)
0 Comments
Correct Answer: D. Al (Aluminium)

Explanation:

The Borax bead test is a classic qualitative analysis method used in inorganic ... Read More Details

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