1.

The oxidation states of Cr in [Cr(H_(2)O)_(6)]Cl_(3), [Cr(C_(6)H_(6))_(2)] and K_(2)[Cr(CN)_(2)(O_(2))(O_(2))(NH_(3))] respectively are -

Answer»

`+3, +4 and +6`
`+3, +2 and +4`
`+3, 0 and +6`
`+3, 0 and +4`

Solution :`[CR(H_(2)O)_(6)]Cl_(3) rArr x+6xx0+3xx(-1)=0`
`rArr x=+3`
`[Cr(C_(6)H_(6))_(2)] rArr x+2xx0 rArr x=0`
`K_(2)[Cr(CN)_(2)(O)_(2)(O_(2))(NH_(3))]rArr+2xx(+1)+x+2(-1)+2xx(-2)+1xx(-2)+1xx0=0`
`rArr x=+6`


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