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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

Magnesium metal does not burn in a vessel containing ?

  • Nitrogen (N₂)
  • Oxygen (O₂)
  • Nitrogen and Oxygen (N₂ and O₂)
  • Neon (Ne)
0 Comments
Correct Answer: D. Neon (Ne)

Explanation:

Magnesium (Mg) is a highly reactive metal that readily combines with several nonmetals ... Read More Details

2 Inorganic Chemistry MCQs

Which of the following elements can form complexes?

  • Sodium (Na)
  • Chromium (Cr)
  • Lithium (Li)
  • Potassium (K)
0 Comments
Correct Answer: B. Chromium (Cr)

Explanation:

Complex formation is a characteristic property of transition elements. These elements have partially ... Read More Details

3 Inorganic Chemistry MCQs

What is the purpose of adding 2% gypsum to cement?

  • Triggers hydration
  • Triggers hydrolysis
  • Prevents rapid hardening
  • All of the above
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Correct Answer: C. Prevents rapid hardening

Explanation:

Cement is a fine inorganic material that, when mixed with water, forms a ... Read More Details

4 Organic Chemistry MCQs

How many benzene rings are present in the fused polycyclic compound phenanthrene?

  • Two
  • Three
  • Four
  • Five
0 Comments
Correct Answer: B. Three

Explanation:

Phenanthrene is a polycyclic aromatic hydrocarbon (PAH) composed of three fused benzene rings ... Read More Details

5 Organic Chemistry MCQs

How many electrons in benzene (C₆H₆) form the delocalized π-electron cloud?

  • 3
  • 4
  • 6
  • 8
0 Comments
Correct Answer: C. 6

Explanation:

Benzene (C₆H₆) is a planar cyclic hydrocarbon consisting of six carbon atoms arranged ... Read More Details

6 Organic Chemistry MCQs

When benzene is substituted by halogens, which halogen gets position 1 in naming the compound?

  • Bromine
  • Chlorine
  • Fluorine
  • Iodine
0 Comments
Correct Answer: C. Fluorine

Explanation:

In organic chemistry, when more than one halogen atom is attached to a ... Read More Details

7 Organic Chemistry MCQs

Benzene was discovered by Michael Faraday during the destructive distillation of vegetable oil in the ?

  • Presence of oxygen
  • Presence of hydrogen
  • Absence of oxygen
  • Presence of excessive oxygen
0 Comments
Correct Answer: C. Absence of oxygen

Explanation:

Benzene (C₆H₆) was discovered by Michael Faraday in 1825 during his experiments on ... Read More Details

8 Organic Chemistry MCQs

How many moles of hydrogen gas (H₂) react with benzene in the presence of a platinum catalyst?

  • 2
  • 3
  • 4
  • 6
0 Comments
Correct Answer: B. 3

Explanation:

Benzene (C₆H₆) is an aromatic compound with six carbon atoms connected in a ... Read More Details

9 Organic Chemistry MCQs

What is the resonance energy of benzene?

  • 150.5 kJ/mol
  • 250.5 kJ/mol
  • 150.5 cal/mol
  • 250.5 cal/mol
0 Comments
Correct Answer: A. 150.5 kJ/mol

Explanation:

Benzene (C₆H₆) is an aromatic compound with a unique stability that cannot be ... Read More Details

10 Organic Chemistry MCQs

Which catalyst is used to prepare benzene from acetylene at 70°C?

  • Cr₂O₃ + Al₂O₃ + SiO₂
  • Raney nickel
  • Organo-nickel
  • Ni (250–300°C)
0 Comments
Correct Answer: C. Organo-nickel

Explanation:

Benzene can be synthesized from acetylene (ethyne) by a process known as trimerization, ... Read More Details

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