Waec Chemistry Past Questions
Question 16
The following are heavy chemicals except
- A. tetraoxosulphate (IV) acid
- B. caustic soda
- C. sodium trioxocarbonate (IV)
- D. ethene
- E. dyes
Question 17
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 18
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 19
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 20
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
