Waec Chemistry Past Questions For Year 1988
Question 16
The main characteristic feature of transition metals is that they
- A. have the same atomic size
- B. are reducing agents
- C. from ions easily
- D. have variable oxidation states
- E. are highly electropositive
Question 17
The following are uses of radioactive isotops except for
- A. sterilization of medical equipment
- B. tracing reaction paths
- C. dating elements
- D. radiography
- E. determining equilibrum positions
Question 18
Which of the following statements is not correct?
- A. Carbon exhibits allotropy
- B. Sulphur exhibits allotropy
- C. Chlorine exhibits allotopy
- D. Nitrogen is a gas
- E. Argon is a noble gas
Question 19
What volume of oxygen will be left unreacted when a mixture of 100cm³ of hydrogen and 200cm,sup>3,/sup> of oxygen are exploded in a eudiometer?
- A. 300cm³
- B. 200cm³
- C. 150cm³
- D. 100cm³
- E. 50cm³
Question 20
Which of the following is not true of the rusting of iron?
- A. Rusting is a reduction process
- B. Rusting of iron takes place in the presence of oxygen and moisture
- C. the rust formed is reddish brown
- D. the major constituent of rust is hydrated iron (lll) oxide
- E. rusting is similar to burning
