Match List I with List II

List-I (Ion)	List-II (Group Number in Cation Analysis)
A. $C{o}^{2+}$	I. Group-I
B.$M{g}^2$	II. Group-III
C.$P{b}^{2+}$	III. Group-IV
D. $A{l}^{3+}$	IV. Group-VI

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

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

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?

Match List I with List II

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