Question

Sodium sulphide react with sodium nitroprusside to form a purple colured compund. During the reaction, the oxidation state of iron :

• A. changes from +2 to +3
• B. changes from +3 to +2
• C. changes from +2 to +4
• D. remains unchanged

Answer 1

The correct option is D remains unchanged

Sodium nitroprusside$\to N{a}_2\left[Fe\right(CN{)}_{5}NO]$

Oxidation state of iron$=+3$

$N{a}_{2}S+$sodium nitroprusside

$\to$sodium thionitroprusside violet colour.

iron oxidation state is $+3$

The oxidation state did not change.