Waec Chemistry Past Questions For Year 2001
Question 11
In which of the reactions represented by the following equations is HNO3 behaving as a typical acid?
- A. CaO + 2HNO3 → Ca(NO3) 2 + H 2O
- B. Cu + 4HNO3 → Cu(NO 3)2 + 2H2O + 2NO2
- C. S + 6HNO3 → H2SO 4 + 6NO2 + 2H2O
- D. P + 5HNO3 → H 3PO 4 + 5NO2 + H2O
Question 12
Which of the following would dissolve in warm dilute H2SO4 without effervescence, to give a blue solution?
- A. Copper turnings
- B. Copper (ll) trioxocarbonate (IV)
- C. Copper (ll) oxide
- D. Copper alloy
Question 13
A mixture of calcium chloride and calcium trioxocarbonate (IV) in water can be separated by
- A. evaporation
- B. sublimation
- C. distillation
- D. filtration
Question 14
Which of the following pairs of reagents reat to produce hydrogen?
- A. Zinc and concentrated trioxonitrate (V) acid
- B. Water and calcium dicarbide
- C. Copper and dilute hydrochloric acid
- D. Magnesium and dilute tetraoxosulphate (VI) acid
Question 15
What is the oxidation number of nitrogen in AI(NO3)3?
- A. + 1
- B. + 3
- C. + 5
- D. + 6
