question_answer 31)

    A molecule of ammonia has (a) Only single bonds                                                      (b) Only double bonds   (c) Only triple bonds                                                       (d) two double bonds and one single bond

Answer:

                  (a) A molecule of ammonia has only single bonds and these are covalent bonds. Note The pair of electrons on the nitrogen atom inmolecule which is not involved in bond formation is called lone pair.