Waec Chemistry 1990 Past Questions and Answers

Question 1:

• WAEC 1990

Catalytic hydrogenation of oils results in the production of

A. Soaps
B. Detergents
C. Alkanes
D. Butter
E. Margarine

Question 2:

• WAEC 1990

Catalytic hydrogenation of oils results in the production of

A. Soaps
B. Detergents
C. Alkanes
D. Butter
E. Margarine

Question 3:

• WAEC 1990

Which of the following reaction will not take place under normal conditions?[sub][/sub]

A. Zn_(s) + 2HCI_2(aq) + H _2(g)
B. Fe _(s) + H ₂SO_4(aq) → FeSO_4(aq) + H_2(g)
C. Cu _(s) + 2HCI _(aq) → CuCI _2(aq) + H_2(g)
D. Ca_(s) + 2H Ca(OH)_2(g)
E. 2Na_(s) + 2H ₂O ₍₁₎ → 2NaOH_(aq) + H_2(g)

Question 4:

• WAEC 1990

A sample of orange juice is suspected to have been contaminated with a yellow dye. Which of the following methods can be used to detect the dye?

A. Decantation
B. Chromatography
C. Distillation
D. Filtration
E. Evaporation

Question 5:

• WAEC 1990

The electronic configuration 1s^{2 2}2s ²2p ⁶3s²3p ⁶ is that of a

A. Noble gas
B. Group ll element
C. Group lll element
D. Group V element
E. Group VI element