Determine whether or not each redox reaction occurs spontaneously in the forward

Question

Determine whether or not each redox reaction occurs spontaneously in the forward direction. Ca^2+ (aq) + Zn(s) rightarrow Ca(s) + Zn^2+ (aq) The reaction should be spontaneous. The reaction should be nonspontaneous (no reaction occurs). 2^Ag+ (aq) + Ni(s) rightarrow 2Ag(s) + Ni^2+ (aq) The reaction should be spontaneous. The reaction should be nonspontaneous (no reaction occurs). Fe(s) + Mn^2+ (aq) rightarrow Fe^2+ (aq) + Mn(s) The reaction should be spontaneous. The reaction should be nonspontaneous (no reaction occurs). 2Al(s) + 3Pb^2+ (aq) rightarrow 2Al^3+ (aq) + 3Pb(s) The reaction should be spontaneous. The reaction should be nonspontaneous (no reaction occurs).

Explanation / Answer

A)
Eo of Zn+ is more than Eo of Ca2+
so Zn2+ should get reduced
But here Ca2+ is getting reduced
Answr: The reaction should be non sponatenous (no reaction occurs)

B)
Eo of Ag+ is more than Eo of Ni2+
so Ag+ should get reduced
which is happening
Answr: The reaction should be sponatenous

C)
Eo of Fe2+ is more than Eo of Mn2+
so Fe2+ should get reduced
But here Mn2+ is getting reduced
Answr: The reaction should be non sponatenous (no reaction occurs)

D)
Eo of Pb2+ is more than Eo of Al3+
so Pb2+ should get reduced
which is happening
Answr: The reaction should be sponatenous

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