Waec Chemistry Past Questions
Question 6
The empirical formula of hydrocarbon containing 0. 12 mole of carbon and 0.36 mole of hydrogen is
- A. CH2
- B. CH3
- C. C2H2
- D. C2H4
- E. C2H6
Question 7
Given that 32.0g sulphur contains 6.02 x 10 23 sulphur atoms how many atoms are there in 2.70g of aluminium? {Al = 27, S =32}
- A. 6.02 x 10 23
- B. 3.01 x 1022
- C. 6.02 x 1022
- D. 5. 08 x 1022
- E. 3.01 x 1022
Question 8
Which of the following does not affect the rate of a chemical reaction?
- A. Addition or presence of a catalyst
- B. Size of the reacting particles
- C. The enthalpy change for the reaction
- D. Concentration of the reactants
- E. Temperatureat which the reaction is carried out
Question 9
Which of the following compound is aromatic?
- A. Benzene
- B. Cyclobutane
- C. Cyclopentane
- D. Hexane
- E. Ethene
Question 10
Which of the following is a neutral oxide?
- A. Nitrogen (IV0 oxide
- B. Carbon (IV) oxide
- C. Sulphur (IV) oxide
- D. Phodphoorus (IV) oxide
- E. Nitrogen oxide
