Waec Chemistry 2019 Past Questions and Answers

Question 36:

• WAEC 2019

The oxidation of chromium in Cr\(_2\)O\(_7)\(-2\) ?

A. +4
B. +5
C. +6
D. +7

Question 37:

• WAEC 2019

The process by which alkanoic acid reacts reversibly with alkanols is known as?

A. Saponification
B. Esterification
C. Carboxylation
D. Halogenation

Question 38:

• WAEC 2019

If the oxidation potential of Mg and Al are +2.37 volts and + 1.66 volts respectively, then the Mg would?

A. Not replace Al
B. Be replaced by Al
C. Remain in the solution
D. Replace Al

Question 39:

• WAEC 2019

consider the reaction represented by the following equation: 2SO\(_2\) + O\(_2\) ⇌ 2SO\(_3\)
A decrease in the pressure of the reaction would

A. Decrease in the concentration of SO\(_2\)
B. Have no effect on the reaction
C. Shift the equilibrium position to the left
D. Shift the equilibrium position to the right

Question 40:

• WAEC 2019

In a mixture of gases which do not react chemically together, the pressure of the individual gas is?

A. Atmospheric pressure
B. Vapor pressure
C. Total pressure
D. Partial pressure