Jamb Chemistry Past Questions For Year 1999
Question 16
Nitrogen obtained from the liquefaction of air has a higher density than that obtained from nitrogen containing compounds because the former contains
- A. water vapour
- B. oxygen
- C. carbon (IV) oxide
- D. rare gases
Question 17
In order to remove one electron from a 3S orbital of gaseous sodium atom, about 496KJMol-1 of energy is required. This energy is referred to as
- A. electron affinity
- B. ionization energy
- C. activation evergy
- D. electronegativity
Question 18
In which of the following are water molecules in the most disorderly arrangement?
- A. Ice at -10°C
- B. Ice at 0°C
- C. Water at 100°C
- D. Steam at 100°C
Question 19
What is observed when aqueous solutions of each of tetraoxosulphate (VI) acid, potassium trioxoiodate (V) and potassium iodide are mixed together?
- A. A white precipitate is formed
- B. A green precipitate is formed
- C. The mixture remains colourless
- D. The mixture turns reddish brown
Question 20
The set of pollutants that is most likely to be produced when petrol is accidentally spilled on plastic materials and ignited is
- A. CO, CO2 and SO2
- B. CO, HCL and SO2
- C. CO, CO2 and HCL
- D. SO2, CO2 and HCL
