Question

$FeC{l}_3$ solution gives blood red colour with $N{H}_{4}SCN$. If $H_{2}S$ gas is passed and filtered, then filtrate does not give red colour with $N{H}_{4}SCN$.

If true enter 1, else enter 0.

Answer 1

$FeC{l}_3$ solution gives blood red colour with $N{H}_{4}SCN$.

$FeC{l}_3+N{H}_{4}SCN\to \underset{red}{\left[Fe\right(SCN\left)\right]C{l}_2}+N{H}_{4}Cl$

$FeC{l}_3$ changes to $FeC{l}_2$ on passing $H_{2}S$.

Hence, no colour change with $N{H}_{4}SCN$ is observed after passing $H_{2}S$.