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JAMB Chemistry 1994 Question 13

Question 13

Chemical Bonding

Elements X, Y and Z belong to groups I, V and VII respectively. Which of the following is TRUE about the bond types of XZ and YZ3?

  1. A.Both are electrovalent
  2. B.Both are covalent
  3. C.XZ is electrovalent and YZ3 is covalent
  4. D.XZ is covalent and YZ3 is electrovalent
Show the answer and explanation

Answer: C (XZ is electrovalent and YZ3 is covalent)

Explanation

A group I metal and a group VII non-metal transfer an electron to form an ionic (electrovalent) bond, as in NaCl. Two non-metals from groups V and VII share electrons, as in PCl3, giving covalent bonds.