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The brown ring test for nitrates depends...

The brown ring test for nitrates depends on

A

The reduction of nitrate to nitric oxide

B

Oxidation of nitric oxide to nitrogen dioxide

C

Reduction of ferrous sulphate to iron

D

Oxidising action of sulphuric acid

Text Solution

Verified by Experts

The correct Answer is:
A
The brown ring is appeared due to the formation of a brown complex between nitric oxide (formed as a result of reduction of the nitrate ion by the `Fe^(2+)` ions) and `Fe^(2+)` ions .
`NO_(3(aq))^(-) + 3Fe_((aq))^(2+) + 4H^(+)(aq) to NO_(g) + 3Fe_(aq)^(3+) + 2H_(2)O_((I))`
`Fe_((aq))^(2+) + NO_((g)) + 5H_(2)O_((I)) to underset("(Brown complex)")underset("Pentaaquanitrosonium iron (I)")([Fe(H_(2)O)_(5)NO^(+)]_((aq))^(2+))`
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