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Verified Answer :

Ni2(SO4) 3 is named Nickel(lll) sulfate. Hope it helps

For the answer to the question above, we need to know first what is the composition of the compound.

So dissecting it we have Ni for nickel and SO4 for sulfate,

So my answer would be Nickel (III) Sulfate)
becauseĀ 
Ionic compounds don't get prefixes like di-, tri-, or any of those.