Jamb Chemistry Past Questions and Answers

Question 1981:

• 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 1982:

• 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 1983:

• 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

Question 1984:

• JAMB 2018

Suitable reagents for the laboratory preparation nitrogen are

A. Sodium dioxonitrate(III) and ammonium chloride
B. Sodium trioxonitrate(V) and ammonium chloride
C. Sodium chloride and ammonium trioxonitrate(V)
D. Sodium chloride and ammonium di-ozonitrate(III)

Question 1985:

• JAMB 2018

The number of electrons in the valence shell of an element of atomic number 14 is?

A. 1
B. 2
C. 3
D. 4