wrong Collins explanation?

[dk00]

22. If phosphoric acid is H3P04 , then what is the formula for phosphorus acid?
explanation 22- -ous always has one less O than -ic



according to google

FeO is named ferrous oxide

Fe2O3 is named ferric oxide

there is a difference of morr then one O here...

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[Cuoreamima8]

Here you're leaving naming acids, to which this -ous is one less O than -ic rule applies. Compounds with a metal and a non-metal are ionic need to be balanced, you can't simply take away an oxygen, for example, because it disrupts the sharing of electrons between thr elements. Transition metals, like, Fe, have multiple oxidation states, affecting how many of another element it bonds to. The ferrOUS ion is Fe2+ and iron with a 2+ oxidation state bonds to one oxygen in ferrOUS oxide because oxygen has a 2- oxidation state. Conversely Fe3+ is the ferrIC ion and iron in Fe2O3, has a 3+ oxidation state and is named ferrIC oxide. They also could be named iron (II) oxide and iron (III) oxide as well instead of using ferrous or ferric, respectively.