The incorrect statement is:

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

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

Ferric ion gives blood red colour with potassium thiocyanate.

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