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Question

What will be the oxidation number of Chromium (Cr) in CrO5?

A
+5
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B
+6
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C
+10
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D
+2
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Solution

The correct option is B +6
In the above structure we can see that, 4 oxygen atomshave a peroxide linkage i.e. (OO) linkage.
So oxidation state of those 4 oxygen atoms is 1 each.
Oxygen atom that has a double bond with Chromium has oxidation state +2
Overall charge on CrO5 is 0
Let the oxidation state of Cr be x
x+(4×(1))+(1×(2))=0x=+6
oxidation state of Cr in CrO5 is +6

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