Metals and their compounds - Jamb Chemistry Past Questions and Answers

Question 6:

• JAMB 1978

When sodium chloride and metallic sodium are each dissolved in water

A. Both processes are exothermic
B. Both processes are endothermic
C. The dissolution of metallic sodium is endothermic
D. The dissolution of metallic sodium is exothermic
E. The dissolution of sodium chloride is explosive

Question 7:

• JAMB 1978

Which of the following metals cannot replace hydrogen from water or steam?

A. Sodium
B. Magnesium
C. Iron
D. Calcium
E. Copper

Question 8:

• JAMB 1978

Brass and bronze are both metallic alloys. Which of the following constituents is common to both alloys?

A. Tin
B. Zinc
C. Copper
D. Lead
E. Aluminium

Question 9:

• JAMB 1978

Which of the following gases may not be dried with concentrated sulphuric acid?

A. HCl
B. N₂
C. Cl₂
D. SO₂
E. NH₃

Question 10:

• JAMB 1978

Which of the following reactions does not take place in the smelting of iron in a blast furnace?

A. CaCO_3(s) CaO_(s) + CO_2(g)
B. C_(s) + O_2(g) CO_2(g)
C. 3FeCO_(s) + 2OCO_2(g) FeO_4(s)
D. SiO_2(s) + CaO_(s) CaCO_3(s)
E. CO_2(g) + C_(s) 2CO_(g)