31. The primary use of sulfur dioxide in industry is:

a) As a refrigerant
b) In the manufacture of sulfuric acid
c) In the production of glass
d) In the manufacture of rubber
Answer: b) In the manufacture of sulfuric acid

32. The Group VA element known for its use in the production of lead-free solder is:

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

33. The Group VIA element that is essential for the formation of proteins and is found in all living organisms is:

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

34. The Group VA element used in the production of semiconductors and solar panels is:

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

35. The common oxidation state of nitrogen in ammonium ion is:

a) +1
b) +2
c) +3
d) +4
Answer: c) +3

36. The element in Group VIA used in the manufacture of glass is:

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

37. The Group VA element used in the production of fireworks is:

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

38. The most stable oxidation state of sulfur in its compounds is:

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

39. The Group VIA element that is used as a component in solar cells is:

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

40. The Group VA element known for its high toxicity and use in pesticides is:

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