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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

Phosphoric acid is a weak acid, and its basicity is __________.

  • 1
  • 3
  • 0
  • 2
0 Comments
Correct Answer: B. 3

Explanation:

Phosphoric acid (H₃PO₄) is an oxyacid of phosphorus and is classified as a ... Read More Details

2 Inorganic Chemistry MCQs

All the elements in Group VIA (Group 16) of the periodic table are __________ in nature.

  • Hygroscopic
  • Metals
  • Polymeric
  • Non-metals
0 Comments
Correct Answer: C. Polymeric

Explanation:

Group 16 elements, known as chalcogens, include oxygen (O), sulfur (S), selenium (Se), ... Read More Details

3 Inorganic Chemistry MCQs

Which allotropic form of phosphorus is the most stable?

  • White phosphorus
  • Black phosphorus
  • Red phosphorus
  • Violet phosphorus
0 Comments
Correct Answer: B. Black phosphorus

Explanation:

Phosphorus exists in several allotropic forms, including white, red, violet, and black phosphorus, ... Read More Details

4 Inorganic Chemistry MCQs

What is the chemical composition of Cinnabar?

  • ZnS
  • PbS
  • HgS
  • FeS
0 Comments
Correct Answer: C. HgS

Explanation:

Cinnabar is a naturally occurring mineral with the chemical formula HgS (mercury(II) sulfide). ... Read More Details

5 Inorganic Chemistry MCQs

Oxygen and sulfur resemble each other in all respects except ____________?

  • Electronic configuration of valence shell electrons
  • Show allotropy
  • Polymeric nature
  • Show same oxidation states
0 Comments
Correct Answer: D. Show same oxidation states

Explanation:

Oxygen (O) and sulfur (S) are both elements of Group 16 (the oxygen ... Read More Details

6 Inorganic Chemistry MCQs

Arsenic oxides are removed by passing them through ?

  • Ferric hydroxide
  • Sodium hydroxide
  • Calcium hydroxide
  • Aluminium hydroxide
0 Comments
Correct Answer: A. Ferric hydroxide

Explanation:

Arsenic oxides, such as arsenious oxide (As₂O₃) and arsenic pentoxide (As₂O₅), are toxic ... Read More Details

7 Organic Chemistry MCQs

When sulphuric acid (H₂SO₄) is treated with ethanol (C₂H₅OH), sulphuric acid acts as:

  • An acid
  • A dehydrating agent
  • An oxidizing agent
  • A sulphonating agent
0 Comments
Correct Answer: B. A dehydrating agent

Explanation:

When ethanol (C₂H₅OH) is treated with concentrated sulphuric acid (H₂SO₄), the acid does ... Read More Details

8 Inorganic Chemistry MCQs

Which one of the following elements has a melting point below 0°C?

  • Nitrogen (N)
  • Phosphorus (P)
  • Carbon (C)
  • Bismuth (Bi)
0 Comments
Correct Answer: A. Nitrogen (N)

Explanation:

The melting point of an element is the temperature at which it changes ... Read More Details

9 Inorganic Chemistry MCQs

The most electronegative element among the following is:

  • Antimony (Sb)
  • Nitrogen (N)
  • Arsenic (As)
  • Phosphorus (P)
0 Comments
Correct Answer: B. Nitrogen (N)

Explanation:

Electronegativity is a measure of the tendency of an atom to attract a ... Read More Details

10 Inorganic Chemistry MCQs

Phosphine gas will be produced if phosphorous acid (H₃PO₃) is subjected to:

  • Oxidation
  • Reduction
  • Decomposition
  • Both B & C
0 Comments
Correct Answer: C. Decomposition

Explanation:

Phosphorous acid (H₃PO₃) is a diprotic acid and an important compound of phosphorus ... Read More Details

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