The Lewis formula of a species must be known when the simple rule for assigning thecoxidation states do not apply to the species.
If true enter 1, else enter 0.
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Solution

The correct option is A 1
The Lewis formula of a species must be known when the simple rule for assigning oxidation states do not apply to the species.
For example, Chromium(VI) peroxide ( $C r O_{5}$ ) has oxidation number of $+ 6$ as it contains $2$ peroxide linkages.
However, if the Lewis structure is not known and simple rule for assigning oxidation states is applied, the oxidation state calculated will be $+ 10$ which is incorrect.
The structure is as follows:

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