Given reaction: Ni(s) + Cd2+(aq) → Ni2+(aq) + Cd(s)
Step 1: Separate half-reactions:
Ni(s) → Ni2+(aq) Cd2+(aq) → Cd(s)
Step 2: Balance the charges:
Ni(s) → Ni2+(aq) + 2 e– Cd2+(aq) + 2 e– → Cd(s)
Ni(s) + Cd2+(aq) → Ni2+(aq) + Cd(s)
Mg(s) + Cr3+(aq) → Mg2+(aq) + Cr(s)
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