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Question

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 SO24=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.

Hence, the correct option is (A).

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