Identify the correct reactions and observatio | vedclass

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(B) $(1)$ The reaction of $NH_4^+$ with Nessler's reagent ($K_2HgI_4$ in $KOH$) gives a brown precipitate of Iodide of Millon's base,not blue. So,$(1)

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$2, 4$

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(B) $(1)$ The reaction of $NH_4^+$ with Nessler's reagent ($K_2HgI_4$ in $KOH$) gives a brown precipitate of Iodide of Millon's base,not blue. So,$(1)$ is incorrect.$(2)$ $Ni^{2+}$ reacts with dimethylglyoxime $(dmg)$ in the presence of $OH^-$ to form a rosy red precipitate of $[Ni(dmg)_2]$. This is correct.$(3)$ $FeCl_3$ reacts with $NH_4OH$ to form a reddish brown precipitate of $Fe(OH)_3$,not green. So,$(3)$ is incorrect.$(4)$ $CuSO_4$ reacts with excess $NH_4OH$ to form a deep blue solution of $[Cu(NH_3)_4]SO_4$. This is correct.Therefore,the correct observations are $(2)$ and $(4)$.

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