Question

Consider the following reaction,

$Nitrite+aceticacid+thiourea⟶N_2+SC{N}^{-}+2H_{2}O$

Formation of the product in the above reaction cannot be identified by:

• A. $FeC{l}_3/HCl$ when blood-red color appears
• B. $FeC{l}_3/HCl$ when blue color appears
• C. $K_{2}C{r}_2{O}_7/HCl$ when green color appears
• D. $KMn{O}_4/HCl$ when colorless solution is formed

Answer 1

Answer: (B), (C), (D)

$KMn{O}_4/HCl$ when colorless solution is formed
$FeC{l}_3/HCl$ when blue color appears
$K_{2}C{r}_2{O}_7/HCl$ when green color appears

Formation of the product in the above reaction can only be identified by $FeC{l}_3/HCl$ when blood-red color appears
$FeC{l}_3+CN{S}^{-}\to \left[Fe\right(CNS\left)\right]C{l}_2$ (Blood red colour) $+C{l}^{-}$

The $SC{N}^{-}$ cannot be identified with others.

So answers are B, C and D.