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Question

Correct formula of the complex formed in the brown ring test for nitrates is ___________.

A
FeSO4NO
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B
[Fe(H2O)5NO]2+
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C
[Fe(H2O)5NO]+
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D
[Fe(H2O)5NO]3+
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Solution

The correct option is C [Fe(H2O)5NO]2+
The correct formula of the complex formed in the brown ring test for nitrates is: [Fe(H2O)5NO]2+
It is formed through the following reaction:
FeSO4+5H2O+NO[Fe(H2O)5NO]SO4

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