Answer
See explanation below.
Work Step by Step
a. Mn (s) + Cd2+ (aq) --> Mn2+(aq) + Cd(s)
b. 3 Fe(s) + 2 NO3-(aq) + 8 H+ (aq) --> 3 Fe2+ (aq) + 2 NO(g) + 4 H2O(l)
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