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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 Organic Chemistry MCQs

What is the most appropriate method for separating a large quantity of a mixture of nonvolatile, nonpolar organic compounds?

  • Distillation
  • Extraction
  • Gas chromatography
  • Column chromatography
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Correct Answer: D. Column chromatography

Explanation:

In organic chemistry, selecting the appropriate separation technique depends on the physical and ... Read More Details

2 Inorganic Chemistry MCQs

In a molecule of carbon monoxide (CO), what are the formal charges on the two atoms?

  • Carbon = 0, Oxygen = 0
  • Carbon = +1, Oxygen = –1
  • Carbon = –1, Oxygen = +1
  • Carbon = 0, Oxygen = –1
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Correct Answer: C. Carbon = –1, Oxygen = +1

Explanation:

To determine the formal charges in a molecule, we use the formula:


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3 Organic Chemistry MCQs

Which of the following solvents would best support an SN2 substitution reaction?

  • Water
  • Hexane
  • Dimethylformamide (DMF)
  • Ethanol
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Correct Answer: C. Dimethylformamide (DMF)

Explanation:

The choice of solvent plays a critical role in determining the rate of ... Read More Details

4 Organic Chemistry MCQs

When an aldehyde reacts with hydrogen cyanide (HCN), a cyanohydrin is formed. This process is best described as:

  • Electrophilic addition
  • Electrophilic substitution
  • Nucleophilic addition
  • Nucleophilic substitution
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Correct Answer: C. Nucleophilic addition

Explanation:

The reaction between aldehydes and hydrogen cyanide (HCN) is a classic example of ... Read More Details

5 Organic Chemistry MCQs

The relatively high energy of the gauche conformation of butane is mainly due to which type of strain?

  • Angle strain
  • Torsional strain
  • Steric strain
  • Orbital strain
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Correct Answer: C. Steric strain

Explanation:

In organic chemistry, the study of conformational analysis helps us understand how molecules ... Read More Details

6 Physical Chemistry MCQs

What is the density of Argon gas at 30 °C temperature and 1.05 atm pressure?

  • 1.65 g/L
  • 1.67 g/L
  • 1.68 g/L
  • None of the above
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Correct Answer: C. 1.68 g/L

Explanation:

The density of a gas can be determined using the ideal gas law, ... Read More Details

7 Organic Chemistry MCQs

The chemical formula C₆H₅–CO–CH₃ represents which compound?

  • Acetone
  • Acetic acid
  • Acetophenone
  • Phenyl acetate
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Correct Answer: C. Acetophenone

Explanation:

The compound with the chemical formula C₆H₅–CO–CH₃ is called acetophenone. It is an ... Read More Details

8 Environmental Chemistry MCQs

Which poisonous gas is present in the exhaust fumes of a jet plane?

  • Fluorocarbon
  • Carbon monoxide
  • Methane
  • C₂H₂ (Acetylene)
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Correct Answer: B. Carbon monoxide

Explanation:

Jet engines burn aviation fuel to produce thrust, and in this process several ... Read More Details

9 Inorganic Chemistry MCQs

In which compound is the O–O (oxygen–oxygen) bond present?

  • H₂S₂O₃ (Thiosulfuric acid)
  • H₂S₂O₈ (Peroxydisulfuric acid)
  • H₂S₄O₆ (Tetrathionic acid)
  • H₂S₂O₆ (Dithionic acid)
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Correct Answer: B. H₂S₂O₈ (Peroxydisulfuric acid)

Explanation:

The oxygen–oxygen bond, also called the peroxide linkage (–O–O–), is a special type ... Read More Details

10 Inorganic Chemistry MCQs

How many lone pairs of electrons are present in XeOF₄ (Xenon oxytetrafluoride)?

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

Explanation:

Xenon oxytetrafluoride (XeOF₄) is a well-known compound of the noble gas xenon. To ... Read More Details

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