mariageerman05
Answered

Which of the following properly lists the metals in order from decreasing to increasing ease of oxidation?

AK < Cr < Cu < Ag
BAg < Cr < Cu < K
CK < Cu < Cr < Ag
DAg < Cu < Cr < K

Verified Answer :

I know it is either B or D, since I know that K will oxidize in water, and Ag will have a tougher time oxidizing.  I am going to lean towards D for my answer.

Dejanras

Answer is: D. Ag < Cu < Cr < K.

Reactivity series is an empirical progression of a series of metals, arranged by their reactivity from highest to lowest (alkaline metals have highest reactivity and Noble metals lowest reactivity):

K > Ba > Sr > Na > Ca > Mg > Be > Al > Mn > Zn > Cr> Fe > Cd > Co > Ni > Sn > Pb > H(in acids) > Cu > Hg > Ag.

Metal higher in the reactivity series will displace another and it will be oxidized.

For example, potassium is more reactive than silver.

Chemical reaction: K + AgCl → KCl + Ag.

Potassium is oxidized (from oxidation number 0 to +1) and silver is reduced (from oxidation number +1 to 0).

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