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Chemistry 2004 WAEC Past Questions

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1
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
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2
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
View Answer & Discuss (1) WAEC 2004
3
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
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4
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
View Answer & Discuss (7) WAEC 2004
5
A nuclide emits a beta-particle (e) in the process, that atomic number
  • A. increases by 1 while the mass numer remains constant
  • B. decreases by 2 while the mass number remains constant
  • C. remains constant while the mass number decreases by 2
  • D. remains constant while the mass number increases by 1
View Answer & Discuss (2) WAEC 2004
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WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709