formula purple colour formed | PRACTICAL ORGANIC CHEMISTRY

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JEE MAIN 2022

28-06-2022 S1

Question

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

Select the correct option:

$\mathrm{NaFe}\left[\mathrm{Fe}(\mathrm{CN})_8\right]$

$\mathrm{Na}\left[\mathrm{Cr}\left(\mathrm{NH}_3\right)_2(\mathrm{NCS})_4\right]$

$\mathrm{Na}_2\left[\mathrm{Fe}(\mathrm{CN})_5(\mathrm{NO})\right]$

$\mathrm{Na}_4\left[\mathrm{Fe}(\mathrm{CN})_5(\mathrm{NOS})\right]$

✓ Correct! Well done.

✗ Incorrect. Try again or view the solution.

Solution

$\mathrm{Na}_2 \mathrm{~S}+\mathrm{Na}_2\left[\mathrm{Fe}(\mathrm{CN})_5 \mathrm{NO}\right] \rightarrow \mathrm{Na}_4\left[\mathrm{Fe}(\mathrm{CN})_5 \mathrm{NO}_5\right]$

Question Tags

JEE Main

Chemistry

Easy

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