Metals and their compounds - Jamb Chemistry Past Questions and Answers

Question 126:

• JAMB 2018

The constituent common to duralumin and alnico is

A. Co
B. Mn
C. Al
D. Mg

Question 127:

• JAMB 2018

The choice of method for extracting a metal from its ores depends on the

A. Strength of the core
B. Position of the metal in the electrochemical series
C. Source of the core
D. Position of the metal in the periodic table

Question 128:

• JAMB 2018

Which of the following produces relatively few ions in solution?

A. NaOH
B. Ca(OH)${}_2$
C. KOH
D. AI(OH)${}_3$

Question 129:

• JAMB 2018

Aluminium does not react with either dilute or concentrated trioxonitrate (V) acid because

A. It is insoluble in either dilute or concentrated trioxonitrate (V) acid
B. It is lower than hydrogen in the electrochemical series
C. The reaction with trioxonitrate (V) acid has a light activation energy
D. An insoluble oxide is formed on its surface which renders it passive

Question 130:

• JAMB 2018

Elements P, Q, R, S have 6, 11, 15, 17 electrons respectively, therefore,

A. P will form an electrovalent bond with R
B. Q will form a covalent bond with S
C. R will form an electrovalent bond with S
D. Q will form an electrovalent bond with S