Jamb Chemistry 2018 Past Questions and Answers

Question 66:

• 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 67:

• JAMB 2018

Which of these sources of water may likely contain the least concentration of Ca\(^{2+}\) and Mg\(^{2+}\)?

A. Spring water
B. River water
C. Tap water
D. Sea water

Question 68:

• JAMB 2018

The conductivity of an acid solution depends on the

A. Amount of ions present and their mobilities
B. Mobilities of the ions present
C. Amount of ions present
D. Temperature of the solution

Question 69:

• JAMB 2018

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

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

Question 70:

• 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