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CGPET 2019 Solved Paper

Section: Chemistry

Question : 65 of 150

Marks: +1, -0

{Fe}^{2+}

to form brown complex?

Solution:

When

{Fe}^{2+}

i.e.,

[{Fe}({H}_{2} {O})] {SO}_{4}

{FeSO}_{4}(a q)

react with NO (nitric oxide), it gives brown ring complex as follows

[{Fe}({H}_{2} {O})_{6}] {SO}_{4}+{NO} \rightarrow

{[{Fe}({H}_{2} {O})_{5} {NO}] {SO}_{4}}↙{brown complex} +{H}_{2} {O}

The brown ring test is used to identify the presence of

{NO}_{3}^{-}

ions.

Hence, option (a) is the correct answer.

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