Jamb Chemistry 2018 Past Questions and Answers

Question 21:

• JAMB 2018

The boiling of fat and aqueous caustic soda is referred to as

A. Hydrolysis
B. Esterification
C. Acidification
D. Saponification

Question 22:

• JAMB 2018

Which of the following pairs of substances will react further with oxygen to form a higher oxide?

A. CO\(_2\) and H\(_2\)O
B. NO and H\(_2\)O
C. CO and CO\(_2\)
D. SO\(_2\) and NO

Question 23:

• JAMB 2018

In the preparation of oxygen by heating KCIO, in the presence of MnO\(_2\) only moderate heat is needed because the catalyst acts by \(_2\)

A. Lowering the pressure of the reaction
B. Increasing the surface area of the reaction
C. Increasing the rate of the reaction
D. Lowering the energy barrier of the reaction

Question 24:

• JAMB 2018

Methanoic acid mixes with water in all proportions and has about the same boiling point as water. Which of the following methods would you adopt to obtain pure water from a mixture of Sand, water and methanoic acid?

A. Fractional distillation
B. Filtration followed by distillation
C. Neutralization with sodium hydroxide followed by distillation
D. Neutralization with sodium hydroxide followed by filtration

Question 25:

• JAMB 2018

A quantity of electricity liberates 3.6g of Silver from its salt. What mass of aluminium Will be liberated from its salt by the same quantity of electricity? [Al = 27, Ag = 108].

A. 2.7g
B. 1.2g
C. 0.9g
D. 0.3g