The metal cadmium tends to form Cd2+ ions. The fol...

Question

The metal cadmium tends to form Cd2+ ions. The following observations are made: (i) When a strip of zinc metal is placed in CdCl2(aq), cadmium metal is deposited on the strip. (ii) When a strip of cadmium metal is placed in Ni(NO3)2(aq), nickel metal is deposited on the strip.Which elements more closely define the position of cadmium
in the activity series?

Jules Bruno · Accepted Answer

We’re being asked to determine which elements more closely define the position of cadmium in the activity series.Recall that the activity series gives us the relative reactivities of metals to oxidation: metals higher in the activity series are more reactive to oxidation and vice-versa.[readmore]MetalNotesLithium (Li+)Can displace Hydrogen from liquid water, steam, and acids.Potassium (K+)Barium (Ba2+)Strontium (Sr2+)Calcium (Ca2+)Sodium (Na+)Magnesium (Mg2+)Can displace Hydrogen from steam and acids.Aluminum (Al3+)Zinc (Zn2+)Chromium (Cr2+, Cr3+)Iron (Fe2+, Fe3+)Cadmium (Cd2+)Can displace Hydrogen from acids.Cobalt (Co2+)Nickel (Ni2+)Tin (Sn2+)Lead (Pb2+)HydrogenAntimony (Sb3+)Arsenic (As3+, As5+)Bismuth (Bi3+)Copper (Cu+, Cu2+)Mercury (Hg22+, Hg2+)Silver (Ag+)Palladium (Pd3+)Platinum (Pt2+, Pt3+)Gold (Au+, Au3+)The reactivity of cadmium was tested by reacting it with zinc metal and nickel metal.However, based on the activity series shown above, there are other metals much closer to cadmium. Cadmium is in between chromium, iron, and cobalt. The position of cadmium can be more defined by its reaction with those three metals.Therefore, chromium, iron, and cobalt will more closely define the position of cadmium in the activity series.

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