Question:
The brown ring test for nitrates depends on
The brown ring test for nitrates depends on
Updated On: May 30, 2022
- the reduction of nitrate to nitric oxide
- oxidation of nitric oxide to nitrogen dioxide
- reduction of ferrous sulphate to iron
- oxidising action of sulphuric acid
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The Correct Option is A
Solution and Explanation
The brown ring is obtained due to the formation of pentaaquanitrosonium ion. In this reaction reduction of nitrate ion by $ Fe^{2+}$ ion takes places as
$ {NO_3 + 3Fe^{2+} + 4H ^+ -> NO + 3Fe^{3+} } + 2H_2O$
${ Fe^{2+} + NO + 5H_2O ->} \underset{\text{Brown complex}}{{[Fe(H_2O)_5NO]} ^{2+}}$
$ {NO_3 + 3Fe^{2+} + 4H ^+ -> NO + 3Fe^{3+} } + 2H_2O$
${ Fe^{2+} + NO + 5H_2O ->} \underset{\text{Brown complex}}{{[Fe(H_2O)_5NO]} ^{2+}}$
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Concepts Used:
Oxidation and Reduction
What is Oxidation?
Oxidation is a chemical process which can be explained by following four point of views
In terms of oxygen transfer
In terms of electron transfer
In terms of hydrogen transfer
In terms of oxidation number
Oxidation in Terms of Oxygen Transfer – Oxidation is gain of oxygen.
What is Reduction?
Reduction is a chemical process which can be explained by following four point of views
In terms of oxygen transfer
In terms of electron transfer
In terms of hydrogen transfer
In terms of oxidation number
Reduction in Terms of Oxygen Transfer – Reduction is loss of oxygen.
What is Redox Reaction?
A chemical reaction which involves transfer of electrons or change in oxidation number of atoms is called redox reaction.