Waec Chemistry Past Questions For Year 1993
Question 21
Which of the following substances is a peroxide?
- A. Na2O2
- B. CuO
- C. PbO4
- D. Fe2O
- E. AI2O
Question 22
Which of the following indicates the correct increasing order of oxidizing power of the halogens?
- A. F < CI < Br < l
- B. l < Br < CI < F
- C. I < CI < Br < F
- D. Br < I < CI < F
- E. CI < F < I < Br
Question 23
An alkene may be converted to an alkane by
- A. halogenation
- B. hydrolysis
- C. dehydration
- D. hydrogenation
- E. decomposition
Question 24
Producer gas is a mixture of
- A. oxygen and hydrogen
- B. Hydrogen and nitrogen
- C. nitrogen and oxygen
- D. nitrogen and carbon (ll) oxide
- E. hydrogen and carbon (ll) oxide
Question 25
In which of the following pairs are both substances deliquescent?
- A. CaCI2 and H2SO4
- B. NaOH and MgSO4 7H2O
- C. CaCI2 and NaOH
- D. CUO and NaCI
- E. CaCO3 and MgCI2
