Test for Nickel(II) Ion

A reagent used to test nickel ion is ______.

Given below are two statements :
Statement (I) : Dimethyl glyoxime forms a six membered covalent chelate when treated with ${\mathrm{NiCl}}_2$ solution in presence of ${\mathrm{NH}}_4\mathrm{OH}.$
Statement (II) : Prussian blue precipitate contains iron both in $\left(+2\right)$ and $\left(+3\right)$ oxidation states.

In the light of the above statements, choose the most appropriate answer from the options given below:

A reagent which gives brilliant red precipitate with Nickel ions in basic medium is  

Statement I: ${\mathrm{Ni}}^{2+}$ with DMG shows red colouration.

Statement II : Both ${\mathrm{Fe}}^{2+} \text{and} {\mathrm{Fe}}^{3+}$ are blue coloured.

Which reagent gives bright red precipitate with ${\mathrm{Ni}}^{2+}$ in basic medium?

Why is ammonium chloride added to the solution during the precipitation of Nickel $\left(\mathrm{II}\right)$ ion with hydrogen sulphide?

Why ${\mathrm{H}}_2\mathrm{S}$ is passed after addition ${\mathrm{NH}}_4\mathrm{Cl}$ and ${\mathrm{NH}}_4\mathrm{OH}$?

In the cyanide test for nickel, what is the colour of the precipitate formed?

Which of the following complexes is formed during the cyanide test for nickel(II) ions?

What type of reaction occurs between nickel ions and bromine water during the test?

Which colour precipitate is observed when bromine water and excess of $\mathrm{NaOH}$reacts with a solution containing nickel ions?

A solution when treated with dimethyl glyoxime gives a rosy red complex. The metal present is

Dimethyl glyoxime forms a coloured complex with