Chemistry 1998 Jamb Past Questions and Answers

Question 26 :

• JAMB 1998

The oxide that remains unchanged when heated in hydrogen is?

A. CuO
B. Fe₂O₃
C. PbO₂
D. ZnO

Question 27 :

• JAMB 1998

Which of the following is observed when a solution of iron (III) chloride is mixed with a solution of sodium hydroxide?

A. A gas is evolved
B. A deep blue precipitate is formed
C. The resultant solution turns green turns
D. A brown precipitate is formed

Question 28 :

• JAMB 1998

The metal that will react with water only in the form of steam to librate hydrogen gas is?

A. Calcium
B. Aluminium
C. Iron
D. Zinc

Question 29 :

• JAMB 1998

A common characteristic shared by iron and aluminium is that both?

A. Are extracted by reduction methods
B. Form only basic oxides
C. Show oxidation states of +2 and +3
D. Form soluble hydroxides

Question 30 :

• JAMB 1998

Alloys are often used in preference to pure metals because?

A. Metals are too hard
B. Merals are ductile
C. Metallic properties are improve in alloys
D. Alloys are a mixture of metals