Waec Chemistry Past Questions For Year 2004
Question 1
Which of the electrons in the following orbitals will experience the greatest nuclear attraction?
- A. 1s electron of helium
- B. 1s electron of potassium
- C. 23 electron of boron
- D. 2s electron of carbon
Question 2
Which of the following properties of elements deceases generally across a period in the Periodic Table?
- A. Electronegativy
- B. Electron affinity
- C. Atomic radluc
- D. lonlzation energy
Question 3
Which of the following electron transition results in the emission of energy?
- A. 3p to 3s
- B. 3p to 4p
- C. 2s to 2p
- D. 1s to 2s
Question 4
The mass of an element is 27 and its atomic number is 13. What is the composition of the nucleus of its atom?
- A. 13 electrons and 14 protons
- B. 13 neutrons and 14 protons
- C. 13 protons and 14 neutrons
- D. 13 electrons and 14 neutrons
Question 5
Which of the following equipment is not used to detect radioactivity?
- A. Wilson cloud chamber
- B. Geiger- muller counter
- C. Mass spectrometer
- D. Photographic plate
