Question 501:

• JAMB 1987

When sodium hydroxide is heated with ammonium tetraoxosulphate (IV), the gas given off may be collected by?

A. Bubbling it through concentrated H₂SO₂
B. Bubbling it through water and then passing it through calcium oxide
C. Passing it directly through calcium oxide
D. Passing it directly through calcium chloride

Question 502:

• 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 503:

• 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 504:

• 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 505:

• JAMB 1987

Corrosion is exhibited by?

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