The brown complex obtained in the detection of nitrate radical is formulated as [Fe(H2O)5NO]SO4. What is the oxidation number of Fe in this complex?
A
1
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B
2
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C
3
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D
0
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Solution
The correct option is B 1 Brown ring test is a confirmatory test for nitrate.
When an aqueous solution of a nitrate salt is treated with ferrous sulphate and conc. sulphuric acid, a brown ring is formed at the junction of two liquids.
We know that,
Charge on SO2−4=−2
Overall charge on complex is +2 and charge on NO=+1.
Let the charge on Fe be x,
So,
x+1=+2
x=+1
Therefore, the oxidation number of Fe in given complex is +1.