Metals and their compounds - Jamb Chemistry Past Questions and Answers

Question 61:

• 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 62:

• 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

Question 63:

• JAMB 1999

200cm³ each of 0.1M solutions of lead (II) trioxonitrate (V) and hydrochloric acid were mixed. Assuming that lead (II) chloride is completely insoluble, calculate the mass of lead (II) chloride that will be precipitated.
[Pb = 207, Cl= 35.5, N = 14, O = 16]

A. 2.78g
B. 5.56g
C. 8.34g
D. 11.12g

Question 64:

• JAMB 1999

Hydrogen is used in oxy-hydrogen flames for melting metals because it

A. Evolves a lot of heat when burnt
B. Combines explosively with oxygen
C. Is a very light gas
D. Is a rocket fuel

Question 65:

• JAMB 1999

What properties of duralumin make it more useful than its constituent metals?

A. It is heavy with a high melting point
B. It is malleable and has high density
C. It is strong and light
D. It is hard and ductile