Redox reaction????????help plzzzz urgent 10 point for first correct answer plzzzzzzzzzzzzzz urgent?

In order for it to be a REDOX reaction the oxidation #s (ionic state/charge) has to change. In (a) Zn is going from a 0 charge to a +2 so it is being oxidized and Cu is going from a +2 to a 0 charge so it is being reduced. In all of the other equations the oxidation #s stay the same for each element on both sides of the equation therefore it is not a REDOX reaction.