Chemistry 1992 Waec Past Questions and Answers

Question 21 :

• WAEC 1992

When sucrose is warmed with Fehling's solution

A. A silver mirror is produced
B. The solution turns milky
C. A brick-red precipitate is formed
D. There is no precipitate
E. A blue coloration is produced

Question 22 :

• WAEC 1992

Which of the following gases will have the highest rate of diffusion under the same conditions? (H = 1, C =12, O = 16, S = 32, CI = 35.5)

A. O₂
B. CI₂
C. HCI
D. H₂S
E. CO₂

Question 23 :

• WAEC 1992

The formula (CH₃),₃ COH is that of a

A. Polyhdric alkanol
B. Secondary alkanol
C. Tertiary alkanol
D. Primary alkanol
E. Trihydric alkanol

Question 24 :

• WAEC 1992

What is the number of oxygen atoms in 32g of the gas? (O = 16, L = 6.0 X 10,²³ mol_-1)

A. 3.2 X 10 ₂₃
B. 6.0 X 10₂₃
C. 1.2 X 10₂₄
D. 1.6 X 10₂₄
E. 2.0 X 10₂₄

Question 25 :

• WAEC 1992

Which of the following compounds is not correct about the reaction of sodium material for the manufacture of plastics?

A. Ethyne
B. Ethane
C. Monochloroethene
D. Propene
E. Butadiene