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Q)

The oxidation states of $Cr$ in $[Cr(H_2O)_6]Cl_3, [Cr(C_6H_6)_2]$, and $K_2[Cr(CN)_2(O)_2(O_2)(NH_3)]$ respectively are :


( A ) $+3, \; 0, $ and $+4$
( B ) $+3, \; 0, $ and $+6$
( C ) $+3, \; +4, $ and $+6$
( D ) $+3, \; +2, $ and $+4$

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