Chemistry - Complete d-block Question with Solution | TestHub

${\mathrm{Cu}}^{2+}$ion gives chocolate coloured precipitate with potassium ferrocyanide solution

${\mathrm{Cu}}^{2+}\mathrm{ }\mathrm{and}\mathrm{ }{\mathrm{Ni}}^{2+}$ions give black precipitate with${\mathrm{H}}_2\mathrm{S}$in presence of HCl solution

Ferric ion gives blood red colour with potassium thiocyanate

${\mathrm{Cu}}^{2+}$salts give red coloured borax bead test in reducing flame