Tests for Magnesium(II) Ion

Cotyledons are also called-

What colour change indicates a positive result for the presence of magnesium ions in the 4-(p-Nitrophenylazo)resorcinol test?

What is the role of $\mathrm{pH}$ in the $4-$(p-Nitrophenylazo)resorcinol test for magnesium ions?

What is the purpose of using ammonium carbonate solution in the qualitative analysis of magnesium $\left(\mathrm{II}\right)$ ions?

When testing for magnesium $\left(\mathrm{II}\right)$ ions, what is the effect of adding excess sodium hydroxide to the white precipitate?

What is the chemical equation representing the formation of the complex between disodium hydrogen phosphate and magnesium ions?

Which reagent is used for the qualitative analysis of group $\mathrm{VI}$?

What is the purpose of using ammonium carbonate solution in the determination of magnesium$\left(\mathrm{II}\right)$ ions?

In the Ammonia Solution Test for Magnesium$\left(\mathrm{II}\right)$ Ion, what is the color of the precipitate formed when ammonia solution is added to a solution containing magnesium ions?

How is the concentration of Magnesium $\left(\mathrm{II}\right)$ ions determined in the Titan Yellow test?

The presence of Mg²⁺ ions in a solution can be tested by adding a solution of

MgSO₄ on reaction with NH₄OH and Na₂HPO₄ forms a white crystalline precipitate. What is its formula?