Question

The oxidation number of Cr in \(CrO_5\) which has the following structure, is: 

• A. +4
• B. +5
• C. +3
• D. +6

Hint:

In peroxide compounds, oxygen generally has an oxidation state of -1. Use this information to balance the oxidation states of other elements.

Answer 1

The Correct Option is D

In \(CrO_5\) (chromium pentoxide), the chromium atom is surrounded by peroxide groups (\(O_2^{2-}\)). To find the oxidation state of Cr, we consider the following: - The peroxide group (\(O_2^{2-}\)) has an overall charge of -2. - There are 5 peroxide groups, so their total charge is -10. - To balance the charge, chromium must have an oxidation state of +6. Thus, the oxidation number of Cr in \(CrO_5\) is +6.