Waec Chemistry 1992 Past Questions and Answers

Question 1:

• WAEC 1992

When steam is passed over white-hot coke, the products are

A. Carbon (IV) oxide and nitrogen
B. Carbon (II) oxide and hydrogen
C. Carbon (ll) oxide and nitrogen
D. Carbon (lV) oxide and steam

Question 2:

• WAEC 1992

When steam is passed over white-hot coke, the products are

A. Carbon (IV) oxide and nitrogen
B. Carbon (II) oxide and hydrogen
C. Carbon (ll) oxide and nitrogen
D. Carbon (lV) oxide and steam

Question 3:

• WAEC 1992

The maximum number of electrons that can accommodated in the shell having the principal quantum number 3 is

A. 3
B. 9
C. 10
D. 18
E. 32

Question 4:

• WAEC 1992

Methanol is obtained from wood by

A. Esterification
B. Bacterial decomposition
C. Combustion
D. Fractional distillation
E. Destructive distillation

Question 5:

• WAEC 1992

Study carefully the reaction represented by the equation below. 2H₂O _2(l) → O _2(g) + 2H₂O_(l). Which of the following will not reaction increase the reaction rate?

A. Heating the hydrogen peroxide
B. Adding a pinch of MnO₂ to the reactant
C. Increasing the concentration of the H₂O₂
D. Adding water to the reactant
E. Exposing the reactant to sunlight