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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 elements can form a tripositive (3⁺) ion?

  • Beryllium
  • Carbon
  • Silicon
  • Aluminium
0 Comments
Correct Answer: D. Aluminium

Explanation:

Elements in Group 13 of the periodic table, such as aluminium (Al), have ... Read More Details

2 Inorganic Chemistry MCQs

Which of the following elements is different in physical appearance from the others?

  • Arsenic
  • Phosphorus
  • Antimony
  • Bismuth
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Correct Answer: B. Phosphorus

Explanation:

Among the elements listed—arsenic (As), phosphorus (P), antimony (Sb), and bismuth (Bi)—phosphorus stands ... Read More Details

3 Inorganic Chemistry MCQs

Most compounds of nitrogen and phosphorus are of which type?

  • Ionic
  • Covalent
  • Polar
  • All varieties are possible
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Correct Answer: B. Covalent

Explanation:

Nitrogen and phosphorus are non-metallic elements in Group 15 (V group) of the ... Read More Details

4 Inorganic Chemistry MCQs

Why is SO₃ not directly absorbed in water?

  • The reaction is highly exothermic
  • It is insoluble in water
  • It forms dilute acid
  • None of the above
0 Comments
Correct Answer: A. The reaction is highly exothermic

Explanation:

Sulfur trioxide (SO₃) is the anhydride of sulfuric acid (H₂SO₄) and reacts readily ... Read More Details

5 Inorganic Chemistry MCQs

Which of the following compounds produces phosphoric acid when it reacts with water?

  • PCl₅
  • P₂O₃
  • P₂O₅
  • All of the above
0 Comments
Correct Answer: D. All of the above

Explanation:

Phosphoric acid (H₃PO₄) is an important oxyacid of phosphorus. Several phosphorus-containing compounds produce ... Read More Details

6 Inorganic Chemistry MCQs

The word “Phosphorus” comes from Greek. What does it mean?

  • Light bearing
  • Fire
  • Impure
  • Tetrahedral
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Correct Answer: A. Light bearing

Explanation:

Phosphorus, an essential chemical element with the symbol P, was discovered in 1669 ... Read More Details

7 Inorganic Chemistry MCQs

Which allotropic form of phosphorus is poisonous?

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

Explanation:

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

8 Organic Chemistry MCQs

Acetic anhydride can be prepared by treating ethyl alcohol with __________?

  • P₂O₅
  • H₂SO₄
  • Both A and B
  • PCl₅
0 Comments
Correct Answer: C. Both A and B

Explanation:

Acetic anhydride ((CH₃CO)₂O) is an important reagent in organic synthesis, widely used for ... Read More Details

9 Inorganic Chemistry MCQs

When phosphorous acid is heated, it decomposes to form phosphoric acid and ?

  • Phosphine
  • Phosphorus
  • Water
  • Phosphorus pentoxide
0 Comments
Correct Answer: A. Phosphine

Explanation:

Phosphorous acid (H₃PO₃) is an important oxyacid of phosphorus that exhibits both acidic ... Read More Details

10 Inorganic Chemistry MCQs

Phosphorus pentoxide (P₂O₅) is a hygroscopic powder that sublimes at __________.

  • 260°C
  • 360°C
  • 630°C
  • 620°C
0 Comments
Correct Answer: B. 360°C

Explanation:

Phosphorus pentoxide (P₂O₅) is one of the most important oxides of phosphorus. It ... Read More Details

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