Waec Chemistry 1993 Past Questions and Answers

Question 1:

• WAEC 1993

Copper metal will react with concentrated trioxonitrate (V) acid to give?

A. Cu(NO₃)₃ + NO + N₂O₄ + H₂O
B. Cu(NO₃)₂ + NO + H₂O
C. CuO + NO₂ + H₂O
D. Cu(NO₂)₃ + NO₂ + H₂O

Question 2:

• WAEC 1993

Copper metal will react with concentrated trioxonitrate (V) acid to give?

A. Cu(NO₃)₃ + NO + N₂O₄ + H₂O
B. Cu(NO₃)₂ + NO + H₂O
C. CuO + NO₂ + H₂O
D. Cu(NO₂)₃ + NO₂ + H₂O

Question 3:

• WAEC 1993

Which of the following separation is routinely applied in the petroleum industry

A. Filtration
B. Chromatography
C. Evaporation
D. Fractional crystallization
E. Fractional distillation

Question 4:

• WAEC 1993

Starch undergoes complete hydrolysis to produce

A. Maltose
B. Lactose
C. Fructose
D. Glucose
E. Sucrose

Question 5:

• WAEC 1993

Which of the following solids has a network structure?

A. Diamond
B. Lodine
C. Sulphur
D. Graphite
E. Lron