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Chemistry 2012 WAEC Past Questions

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6

The d-block elements are paramagnetic because they

  • A. contain paired electrons which are repelled by magnetic field
  • B. contain unpaired electrons in the partially filled 3d-orbital
  • C. contain paired electrons which are repelled by magnetic field force
  • D. have delocalized valence electrons
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7

Which of the following statements about a radioactive substance is/are correct? l. lt emits radiation continuously and spontaneously. ll. The emitted radiations are affected by temperature and pressure III. The radiation can penetrate opaque matter

  • A. ll only
  • B. l and ll only
  • C. l and lll only
  • D. ll and lll only
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8

Which of the following elements is a metalloid?

  • A. Carbon
  • B. Oxygen
  • C. Silicon
  • D. Sodium
View Answer & Discuss (4) WAEC 2012
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9

Which of the following halogens is liquid at room temperature?

  • A. Chlorine
  • B. Fluorine
  • C. lodine
  • D. Bromine
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10

The shape of a graphite crystal is

  • A. tetrahedral
  • B. pyramidal
  • C. hexagonal
  • D. octahedral
View Answer & Discuss (7) WAEC 2012
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