Metals and their compounds - Jamb Chemistry Past Questions and Answers

Question 41:

• JAMB 1986

Which of the following metals does NOT form a stable trioxocarbonate (IV)?

A. Fe
B. Al
C. Zn
D. Pb
E. None of the options is correct

Question 42:

• JAMB 1986

Which of the following sulphides is insoluble in dilute HCl?

A. Na₂S
B. ZnS
C. CuS
D. FeS

Question 43:

• JAMB 1986

The iron (III) oxide impurity in bauxite can be removed by?

A. Fractional crystallization in acid solution
B. Dissolution in sodium hydroxide and filtration
C. Extraction with concentrated ammonia and reprecipitation
D. Electroysis of molten mixture

Question 44:

• JAMB 1986

Which of the following does NOT contain aluminium as component?

A. Over-head cables
B. Duralumin
C. Container for caustic soda
D. Container for nitric acid

Question 45:

• JAMB 1986

How will a metal X, which reacts explosively with air and with dilute acids be best extracted from its ores?

A. Electrolysis of solution of its salts
B. Decomposition of its oxides
C. Displacement from solution by an alkali metal
D. Electroiysis of fused salt