Metals and their compounds - Jamb Chemistry Past Questions and Answers

Question 46:

• JAMB 1987

Which of the following elements will form oxide which will dissolve both in dilute HNO₃ and NaOH solutions to form salts?

A. Al
B. Mg
C. Ag
D. Mn

Question 47:

• JAMB 1987

Stainless steel is an alloy of?

A. Iron, carbon and silver
B. Iron, carbon and lead
C. Iron, carbon and chromium
D. Iron and carbon only

Question 48:

• JAMB 1987

Alloys are best prepared by?

A. High temperature weilding of the metals
B. Electrolysis using the major metallic component as cathode
C. Reducing a mixture of the oxies of the elements
D. Cooling a molten mixture of the necessary elements

Question 49:

• JAMB 1987

Corrosion is exhibited by?

A. Iron only
B. Electropostive metals
C. Metals below hydrogen inthe electrochemical series
D. All metals

Question 50:

• JAMB 1989

Which of the following is NOT involved in the extraction of metals from their ores?

A. Reduction with carbon
B. Reduction with other metals
C. Reduction by electrolysis
D. Oxidation with oxidizing agents