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(D) Mohr's salt is a double salt with the chemical formula $(NH_4)_2SO_4 \cdot FeSO_4 \cdot 6H_2O$. In an aqueous solution,it dissociates completely i

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(D) Mohr's salt is a double salt with the chemical formula $(NH_4)_2SO_4 \cdot FeSO_4 \cdot 6H_2O$. In an aqueous solution,it dissociates completely into its constituent ions: $(NH_4)_2SO_4 \cdot FeSO_4 \cdot 6H_2O (aq) \rightarrow 2NH_4^+ (aq) + Fe^{2+} (aq) + 2SO_4^{2-} (aq) + 6H_2O (l)$. Since all these ions ($NH_4^+$,$Fe^{2+}$,and $SO_4^{2-}$) are present in the solution,the aqueous solution of Mohr's salt gives the test for all of them.

Aqueous solution of Mohr's salt gives the test of which ions?

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