Unit 3: Group IIIA and Group IVA Elements

41. The Group IVA element that is used in the production of lead-acid batteries is:

a) Carbon
b) Silicon
c) Tin
d) Lead
Answer: d) Lead

42. The property of silicon that makes it useful in semiconductor technology is:

a) Its metallic nature
b) Its ability to form stable covalent bonds
c) Its high reactivity
d) Its high density
Answer: b) Its ability to form stable covalent bonds

43. The Group IIIA element used as a fire retardant is:

a) Boron
b) Gallium
c) Aluminum
d) Indium
Answer: a) Boron

44. The common oxidation state of carbon in organic compounds is:

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

45. The Group IVA element used in making solder alloys is:

a) Carbon
b) Silicon
c) Tin
d) Lead
Answer: c) Tin

46. The primary property of lead that makes it useful in radiation shielding is:

a) Its low density
b) Its high density
c) Its high reactivity
d) Its low melting point
Answer: b) Its high density

47. The Group IIIA element that is used in producing borosilicate glass is:

a) Boron
b) Gallium
c) Aluminum
d) Indium
Answer: a) Boron

48. The property of silicon that contributes to its use in computer chips is:

a) Its low cost
b) Its hardness
c) Its ability to conduct electricity
d) Its softness
Answer: c) Its ability to conduct electricity

49. The most stable oxidation state of lead is:

a) +2
b) +4
c) +6
d) 0
Answer: a) +2

50. The Group IVA element that is the basis of organic chemistry is:

a) Carbon
b) Silicon
c) Tin
d) Lead
Answer: a) Carbon