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1 Pakistan Studies MCQs
Assistant Director - PESSI

Taluja Fort is located in which country?

  • India
  • Pakistan
  • Nepal
  • Bangladesh
0 Comments
Correct Answer: B. Pakistan

Explanation:

Taluja Fort (also known as Tulaja Fort) is located in the Soon Valley of the ... Read More Details

2 Chemistry MCQs

Why is CO₂ a gas while SiO₂ is a solid at room temperature?

  • Carbon non-metal, silicon semi-metal
  • CO₂ = molecule, SiO₂ = network structure
  • CO₂ forms multiple bonds, silicon does not
  • Silicon has only sigma bonds
0 Comments
Correct Answer: B. CO₂ = molecule, SiO₂ = network structure

Explanation:

The difference in physical state between carbon dioxide (CO₂) and silicon dioxide (SiO₂) ... Read More Details

3 Inorganic Chemistry MCQs

Which of the following statements about carbon monoxide (CO) is correct?

  • It combines with H₂O to form carbonic acid
  • It reacts with the hemoglobin in red blood cells
  • It is a powerful oxidizing agent
  • It is used to prepare aerated drinks
0 Comments
Correct Answer: B. It reacts with the hemoglobin in red blood cells

Explanation:

Carbon monoxide (CO) is a simple molecule composed of one carbon atom and ... Read More Details

4 Inorganic Chemistry MCQs

Boric acid cannot be used in which of the following applications?

  • As an antiseptic in medicine
  • For washing eyes
  • In soda bottles
  • For enamel and glazes
0 Comments
Correct Answer: C. In soda bottles

Explanation:

Boric acid (H₃BO₃) is a weak, inorganic acid with mild antiseptic, antifungal, and ... Read More Details

5 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

6 Inorganic Chemistry MCQs

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

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

Explanation:

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

7 Inorganic Chemistry MCQs

Most compounds of nitrogen and phosphorus are of which type?

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

Explanation:

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

8 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

9 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

10 Inorganic Chemistry MCQs

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

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

Explanation:

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