Question

Sodium nitroprusside when added to an alkaline solution of sulphide ions produces purple colouration due to the formation of :

• A. $Na\left[Fe\right(H_{2}O{)}_{5}NOS]$
• B. $N{a}_4\left[Fe\right(CN{)}_{5}NOS]$
• C. $N{a}_3\left[Fe\right(CN{)}_{5}NOS]$
• D. $N{a}_4\left[Fe\right(H_2{O}_5\left)NOS\right)]$

Answer 1

The correct option is B $N{a}_4\left[Fe\right(CN{)}_{5}NOS]$

$N{a}_{2}S+N{a}_2\left[Fe\right(CN{)}_{5}NO]\to N{a}_4[Fe\left(CN{)}_{5}NOS\right]$ (purple colouration) Sodium thionitroprusside