Waec Chemistry Past Questions For Year 1993
Question 1
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
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 3
Which of the following pairs illustrates isotopy?
- A. But-l-ene and but -2-ene
- B. Ortho-hydrogen and parahydrogen
- C. Oxygen and ozone
- D. Hydrogen and deuterium
- E. Alpha-particle and beta-particle
Question 4
Alkanes are used mainly
- A. in the production of plastics
- B. as domestic and industrial fuels
- C. in the textile industry
- D. in the hydrogenation of oils
- E. as fine chemicals
Question 5
Trioxosulphate (lV) acid is not stored for a long period because it
- A. is a weak dibasic acid
- B. has bleaching properties
- C. is unstable and eaily decomposed
- D. smells strongly of sulphur (lV) oxide
- E. can act as a germicide
