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Question

The oxidation states of Cr in:

[Cr(H2O)6]Cl3 , [Cr(C6H6)2] and K2[Cr(CN)2(O)2(O2)(NH3)], respectively, are:

A
+3 , +4 and +6
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B
+3 , +2 and +4
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C
+3 , 0 and +6
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D
+3 , 0 and +4
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