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Question

Oxidation number of Cr in (NH3)3Cr(O2)2 is:

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Solution

Let x be the oxidation number of Cr in (NH3)3Cr(O2)2.
Since, the overall charge on the complex is 0, the sum of oxidation states of all elements in it should be equal to 0.
Therefore, 3(0)+x+2(2)=0
Hence, x=+4
Thus, the oxidation number of Cr in (NH3)3Cr(O2)2 is +4.

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