Sodium nitroprusside when added to an alkaline solution of sulphide ions produces a:

Schweitzer's reagent,used for dissolving cellulose in the manufacture of artificial silk,is

The complex $[Co(NH_3)_5Br]SO_4$ will give a white precipitate with:

The reagent used for the detection of $Ni^{2+}$ is $A$. $x$ moles of $A$ react with $Ni^{2+}$ to form a complex of $C$ color. $A$,$x$,and $C$ are respectively:

The solution of $II A$ group precipitate in dilute $HNO_3$ when treated with $NH_4OH$ becomes blue because of the presence of

Assign $A$,$B$,$C$,$D$ from the given type of reaction.
$K_4[Fe(CN)_6] + ZnSO_4 \longrightarrow Zn_2[Fe(CN)_6] \downarrow + 2K_2SO_4$