11. The common oxidation state of Group VA elements is:

a) +1
b) +2
c) +3
d) +5
Answer: d) +5

12. The most common allotrope of phosphorus is:

a) White phosphorus
b) Red phosphorus
c) Black phosphorus
d) Purple phosphorus
Answer: b) Red phosphorus

13. Which element in Group VA is used in the production of fertilizers?

a) Nitrogen
b) Phosphorus
c) Arsenic
d) Antimony
Answer: b) Phosphorus

14. The oxide of nitrogen that is commonly used in the production of nitric acid is:

a) NO
b) NO₂
c) N₂O
d) N₂O₅
Answer: b) NO₂

15. The primary use of sulfuric acid is:

a) In fertilizers
b) In batteries
c) As a disinfectant
d) In detergents
Answer: a) In fertilizers

16. The element in Group VIA known for its use in rubber vulcanization is:

a) Oxygen
b) Sulfur
c) Selenium
d) Tellurium
Answer: b) Sulfur

17. Which of the following elements is a metalloid in Group VA?

a) Arsenic
b) Phosphorus
c) Antimony
d) Nitrogen
Answer: a) Arsenic

18. The common oxidation state of sulfur in its compounds is:

a) +2
b) +4
c) +6
d) +8
Answer: c) +6

19. The element in Group VA that is used in the production of semiconductors is:

a) Nitrogen
b) Phosphorus
c) Arsenic
d) Antimony
Answer: c) Arsenic

20. The common allotrope of sulfur that is found in nature is:

a) Sulfur dioxide
b) Sulfur trioxide
c) Rhombic sulfur
d) Monoclinic sulfur
Answer: c) Rhombic sulfur