The reactions listed below are either chemical reactions or nuclear reactions. Which are nuclear reactions? Check all that apply. Upper H superscript plus, plus upper O upper H superscript minus right arrow upper H subscript 2 upper O. Superscript 185 subscript 79 upper A u right arrow superscript 181 subscript 77 upper R d plus superscript 4 subscript 2 upper H e. 4 upper F e plus 3 upper O subscript 2 right arrow 2 upper F e subscript 2 upper O subscript 3. Superscript 210 subscript 84 upper P o right arrow superscript 206 subscript 82 upper P b plus superscript 4 subscript 2 upper H e.