Question

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Answer 1

Answer:

Rules for Assigning Oxidation Numbers

The convention is that the cation is written first in a formula, followed by the anion. ...

The oxidation number of a free element is always 0. ...

The oxidation number of a monatomic ion equals the charge of the ion. ...

The usual oxidation number of hydrogen is +1. ...

The oxidation number of oxygen in compounds is usually -2.