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  • The formula of the purple colour formed in Laissaigne's test for sulphur using sodium nitroprusside isOption: 1 <img alt="\mathrm{NaFe}\left[\mat

The formula of the purple colour formed in Laissaigne's test for sulphur using sodium nitroprusside is

Option: 1

\mathrm{NaFe}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]


Option: 2

\mathrm{Na}\left[\mathrm{Cr}\left(\mathrm{NH}_{3}\right)_{2}(\mathrm{NCS})_{4}\right]


Option: 3

\mathrm{Na}_{2}\left[\mathrm{Fe}(\mathrm{CN})_{5}(\mathrm{NO})\right]


Option: 4

\mathrm{Na}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{5}(\mathrm{NOS})\right]


Answers (1)

best_answer

The purple or violet colouration due to the formation of the complex compound \mathrm{Na}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{5} \mathrm{NOS}\right] confirms the presence of sulphide ion in the salt.

\mathrm{Na_{2}S+\underset {\text{Sodium nitroprusside}}{Na_{2}\left [ Fe(CN)_{5}NO \right ]}\rightarrow \underset{\text{Purple complex}}{Na_{4}\left [Fe(CN) _{5}NOS\right ]}

Hence,Option (4) is correct.

Posted by

Rakesh

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