question_answer 50)

    The electronic configuration of (II) is where as that of (l) is  Which of the following is correct?                              (a) Cu (II) is more stable (b) Cu (ll) is less stable                                                 (c) Cu (l) and Cu (ll) are equally stable                                                 (d) Stability of Cu (l) and Cu(ll) depends on nature of copper salts

Answer:

                                    (a) Cu (ll) is more stable than Cu (l). As it is known that, Cu (l) has 3d10 stable configuration while, Cu (ll) has  configuration. But Cu (ll) is more stable due to greater effective nuclear charge of Cu (ll) i.e., it hold 17 electrons instead of 18 in Cu (l).