Jamb Chemistry 1987 Past Questions and Answers

Question 6:

• JAMB 1987

Which of the following gases can best be used for demonstrating the fountain experiment?
i) Nitrogen (ii) Ammonia (iii) Nitrogen (I) oxide
(iv) Hydrogen chloride.

A. Ii and iii
B. I and iii
C. Ii and iv
D. Ii only

Question 7:

• 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 8:

• 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 9:

• 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 10:

• 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