The metal cadmium tends to form Cd2+ ions. The following
observations are made: (i) When a strip of zinc metal is placed
in CdCl21aq), cadmium metal is deposited on the strip. (ii)
When a strip of cadmium metal is placed in Ni1NO3221aq),
nickel metal is deposited on the strip.
(b) Which elements more closely define the position of cadmium
in the activity series?
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