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It's probably better to know those, but also probably better do just do enough practice problems and look at enough compounds (and names of compounds) so that you internalize them without having to outright memorize them.
I think it would make it easier if you were familiar with the common charges/oxidation numbers of the ligands. Rather than just trying to memorize them alone, it might be better to just do more practice problems so you can remember their oxidation numbers from seeing them in problems many times.
I think we should be able to recognize a few, but the test could possibly have the oxidation number of the ligands given to us so that we only have to solve for the oxidation number of the cation, but this is just a guess.
I believe on the final we would be likely to calculate for the oxidation number given a chemical formula. For example [Ni(CN)4]^2- , in which case it will be helpful if you remembered that CN has a charge of -1. The answer to the example is that the oxidation number is +2. This was on one of the UA's worksheet, so it is a fair test question, in my opinion.
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