1.

What is the oxidation state of Co[Co(H_(2)O)_(5)Cl]^(2+) ?

Answer»

`+2`
`+3`
`+1`
`+4`

Solution :Since, the O.N of `SO_(4)^(2-)` is -2, therefore the total charge on the COMPLEX ion, `[Fe(H_(2)O)_(5)NO]` is +2. Since No is paramagnetic MOLECULE, its unpaired electron is transferred to iron. As a result, NO CARRIES +1 charge. Further, since `H_(2)O` is a neutral molecule, its O.N is ZERO. Putting the values of all the oxidation numbers, the O.N of Fe in the complex ion `= x+0 xx 5 + 1=2`
`:. n = +1`
Thu the O.N of Fe is +1 and the correct structure of the `|Fe(H_(2)O)_(5)NO|SO_(4)` is `|Fe^(+1)(H_(2)O)_(5)NO|SO_(4)`.


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