WAEC 2005 : Chemistry

1The electronic configuration of an element X is 1s22s 22s63p 2 3p4. It can be deduced that X

  • A. Belongs to group 6 of the Periodic Table
  • B. Belongs to group IV of the Periodic Table
  • C. has 3 unpaired electrons in its atom
  • D. has relative molecular mass of 16
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2What is the mass number of an element having 20 neutrons, 15 protons and 15 electrons

  • A. 15
  • B. 30
  • C. 35
  • D. 50
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3Which of the following sets of elements are arranged in order of decreasing atomic size in the Periodic Table

  • A. 6C, 4Be, 7N,8 O
  • B. 4Be,6 C,7 N,8 O
  • C. 8O, 7 N, 6C, 4Be
  • D. 7N, 8O, 6C,4BeBe
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4Which of the following changes is characteristic of an alpha-particle emission

  • A. the nucleus loses two protons and two neutrons
  • B. a proton combines with an electron giving off heat
  • C. the nucleus splits into two equal parts
  • D. four neutrons are lost
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5An element X has an atomic number of 16. What is its most likely oxidation state in its binary compounds

  • A. -3
  • B. -2
  • C. 2
  • D. 4
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