Metals and their compounds - Jamb Chemistry Past Questions and Answers

Question 1:

• JAMB 2019

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 2:

• JAMB 2019

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

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

Question 3:

• JAMB 2019

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 4:

• JAMB 2019

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

A. CaCO3(s) CaO(s) + CO2(g)
B. C(s) + O2(g) CO2(g)
C. 3FeCO(s) + 2OCO2(g) FeO4(s)
D. SiO2(s) + CaO(s) CaCO3(s)
E. CO2(g) + C(s) 2CO(g)

Question 5:

• JAMB 2019

If excess zinc is added to a bluish green solution of copper (II) sulphate, and the excess zinc filtered off after completion of reaction, a colourless solution is obtained because

A. Both zinc and copper are metals
B. The sulphate radical and the zinc ion are divalent
C. Zinc is more electropositive than copper
D. Both zinc and copper form depositive ions in solution
E. Zinc is a reducing agent