Multiple Choice
Which of the following statements concerning aluminum is false?
A) Sapphires and rubies are composed principally of aluminum oxide.
B) Aluminum hydroxide is amphoteric.
C) Aluminum can have both +1 and +3 oxidation states.
D) The main industrial source of aluminum is bauxite ore.
E) Corundum is a hard mineral of aluminum oxide.
Correct Answer:
Verified
Correct Answer:
Verified
Q19: What is the principal source of commercial
Q20: Which of the following is the acid
Q21: The commercial method of isolating magnesium from
Q22: Nitric acid is obtained commercially from<br>A)NH<sub>3</sub>.<br>B)NH<sub>4</sub>NO<sub>3</sub>.<br>C)Mg<sub>3</sub>N<sub>2</sub>.<br>D)NaNO<sub>2</sub>.<br>E)CO(NH<sub>2</sub>)<sub>2</sub>.
Q23: Which of the following statements concerning lead
Q25: Roasting is an example of which step
Q26: Most HCl(g)is obtained commercially<br>A)by reaction of MnO<sub>2</sub>
Q27: What is the acid anhydride of perchloric
Q28: A chemical method of isolating aluminum oxide
Q29: Which of the following statements concerning calcium