JEE MAIN - Chemistry (2025 - 2nd April Evening Shift - No. 13)
Formation of $\mathrm{Na}_4\left[\mathrm{Fe}(\mathrm{CN})_5 \mathrm{NOS}\right]$, a purple coloured complex formed by addition of sodium nitroprusside in sodium carbonate extract of salt indicates the presence of :
Sulphide ion
Sulphite ion
Sulphate ion
Sodium ion
Explanation
$\underset{\substack{\text { Sodium } \\ \text { sulphide }}}{\mathrm{Na}_2 \mathrm{S}}+\underset{\substack{\text { Sodium nitro } \\ \text { Prusside }}}{\mathrm{Na}_2\left[\mathrm{Fe}(\mathrm{CN})_5 \mathrm{NO}\right]}\rightarrow \underset{\substack{\text { Violet Colour } \\ }}{\mathrm{Na}_4\left[\mathrm{Fe}(\mathrm{CN})_5 \mathrm{NOS}\right]}$
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