Analytical Chemistry Question 129
Question: Sodium nitroprusside when added to an alkaline solution of sulphide ions produce a
[AFMC 2005]
Options:
A) Red colouration
B) Blue colouration
C) Purple colouration
D) Brown colouration
Show Answer
Answer:
Correct Answer: C
Solution:
$ Na_2S+\underset{sodiumnitroprusside}{\mathop{Na_2[Fe(NO){{(CN)}_5}]}}\to $
$ \underset{violetcolouredcomplex}{\mathop{Na_3[Fe(ONSNa){{(CN)}_5}]}} $ or $ \underset{purplecolourcomplex}{\mathop{Na_4[Fe{{(CN)}_5}NOS]}} $
BETA
