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Chemistry 1999 WAEC Past Questions

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1
Which of the following atoms contains the highest number of electrons in the outermost shell?
  • A. 8O
  • B. 10Ne
  • C. 15P
  • D. 19K
View Answer & Discuss (2) WAEC 1999
2
What is the electronic configuration of an element represented as 199X?
  • A. 1s 22s2 2p 5
  • B. 1s22s23s23p3
  • C. 1s2 2s2 2p 33s2
  • D. 1s 22s22p 63s23p64s 1
View Answer & Discuss (3) WAEC 1999
3
Pauli Exclusion Principle is related to
  • A. quantum numbers of electrons
  • B. reversiblility of equlibrium reactions
  • C. electronegativity values of elements
  • D. collision theory of reaction rates
View Answer & Discuss (2) WAEC 1999
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
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4
Which of the orbitals 4s, 4p, 4d and 4f has the lowest energy?
  • A. 4f
  • B. 4p
  • C. 4d
  • D. 4s
View Answer & Discuss WAEC 1999
5
Two radioactive elements Q and S have half-life periods of 10 hours and 20 hours respectively. Therefore
  • A. S decays faster than Q
  • B. Q is twice as stable as S
  • C. Q emits fewer particles than S
  • D. S is more stable than Q
View Answer & Discuss WAEC 1999
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