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1 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
0 Comments
Correct Answer: C. Nucleophilic addition

Explanation:

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

2 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
0 Comments
Correct Answer: C. Steric strain

Explanation:

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

3 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
0 Comments
Correct Answer: C. 1.68 g/L

Explanation:

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

4 Organic Chemistry MCQs

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

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

Explanation:

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

5 Environmental Chemistry MCQs

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

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

Explanation:

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

6 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)
0 Comments
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

7 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

8 Inorganic Chemistry MCQs

Who discovered Argon gas?

  • Lord Rayleigh
  • Sir William Ramsay
  • Lockyer
  • John Dalton
0 Comments
Correct Answer: B. Sir William Ramsay

Explanation:

Argon is a noble gas and one of the important elements in the ... Read More Details

9 Basic Computer MCQs
Assistant Director - PESSI

1 Gigabyte (GB) is equal to how many bytes?

  • 1,000,000 bytes
  • 1,000,000,000 bytes
  • 1,073,741,824 bytes
  • Both B and C (depending on usage)
0 Comments
Correct Answer: D. Both B and C (depending on usage)

Explanation:

Answer: Both B and C (depending on usage)


The definition of ... Read More Details

10 Islamic Studies MCQs

Name the place which is called the Sacred Monument in the Holy Quran?

  • Mina
  • Arafat
  • Muzdalfa
  • Hateem
0 Comments
Correct Answer: D. Hateem

Explanation:

In the Holy Quran, the place known as the Sacred Monument is Hateem, which is ... Read More Details

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