Question

1. The oxidation number of Cl in NOCIO4​

Answer 1

Answer:

Since ClO4 has a 1- charge, and we know each Oxygen's oxidation state is usually 2-, four oxygens amount to 8-. As the final charge of the perchlorate ion is 1-, that means Cl must have a positive charge of +7 to balance the negatives (ie 7-8 = -1).

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