Unit 3: Group IIIA and Group IVA Elements

21. Which of the following elements in Group IIIA is known for its use in LED lights?

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

22. The group IVA element that has the highest density is:

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

23. The oxides of Group IVA elements generally exhibit which type of behavior?

a) Acidic
b) Basic
c) Amphoteric
d) Neutral
Answer: c) Amphoteric

24. Which Group IIIA element is used as a neutron absorber in nuclear reactors?

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

25. The chemical reactivity of carbon is highest in which of its forms?

a) Diamond
b) Graphite
c) Fullerenes
d) Graphene
Answer: d) Graphene

26. The primary component of most Group IVA compounds is:

a) Oxygen
b) Hydrogen
c) Carbon
d) Nitrogen
Answer: c) Carbon

27. Which Group IIIA element is a metalloid?

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

28. The general trend in ionization energy as you move across Group IVA from left to right is:

a) Decreases
b) Increases
c) Remains constant
d) First increases, then decreases
Answer: b) Increases

29. Which Group IIIA element is used in the production of high-purity aluminum?

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

30. The common use of silicon in technology is:

a) In batteries
b) In glassmaking
c) In solar panels
d) In synthetic rubber
Answer: c) In solar panels