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JAMB Chemistry 1982 Question 42

Question 42

Chemical Bonding

In the reaction NH3 + H+ → NH4+, the bond formed results from

  1. A.an electron transferred from NH3 to H+
  2. B.an electron pair donated by NH3
  3. C.an electron pair equally shared
  4. D.an electron pair donated by H+
  5. E.an electron transferred from H+ to NH3.
Show the answer and explanation

Answer: B (an electron pair donated by NH3)

Explanation

The lone pair on nitrogen is given to the H+, which has no electrons, forming a dative (co-ordinate) bond.