Waec Chemistry Past Questions For Year 1996
Question 16
In which of the following compounds is the oxidation number of nitrogen equal to + 3?
- A. NO 2
- B. N 2O
- C. NO
- D. HNO2
- E. HNO3
Question 17
What amount of hydrogen will be required for complete hydrogenation of one mole of pent-3-yne?
- A. 1 mole
- B. 2 moles
- C. 3 moles
- D. 5 moles
- E. 6 moles
Question 18
When acidified KMnO4 solution is decolorised by ethene, the gas acts as
- A. a straight-chain hydrocarbon
- B. a saturated hydrocarbon
- C. a reducing agent
- D. a dehydrating agent
- E. an oxidizing agent
Question 19
On exposing palm wine to air for some days, it becomes sour owing to the conversion of
- A. glucose to ethanol
- B. glucose to gluconic acid
- C. ethanol to ethanoic acid
- D. ethanol to ethanal
- E. palm wine to palmitic acid
Question 20
Which of the following exhibits resonance?
- A. Benzene
- B. Butane
- C. Pentene
- D. Octana
- E. Hexene
