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Consider the qualitative analysis of cations present in a solution. The flowchart for the experiment is below.

Consider the experimental procedure below on a solution containing $\textrm{Ag}^+$ and $\textrm{Fe}^{3+}$ ions. In which steps will a precipitate form? 1) $0.50 \textrm{ M HCl}$ was added to the unknown solution.
Select Option Precipitate formed.No precipitate formed.
. 2) $0.50 \textrm{ M NaOH}$ was added to the solution.
Select Option Precipitate formed.No precipitate formed.
. 3) The supernatant was decanted from the precipitate. 4) To the supernatant, $0.50 \textrm{ M K}_4\textrm{Fe(CN)}_6$ was added.
Select Option Precipitate formed.No precipitate formed.
. 5) To the precipitate, $0.10 \textrm{ M HNO}_3$ was added. The precipitate dissolved. 6) $0.050 \textrm{ M NH}_3$ was added to the solution.
Select Option Precipitate formed.No precipitate formed.
. 7) $0.50 \textrm{ M K}_4\textrm{Fe(CN)}_6$ was added to the solution.
Select Option Precipitate formed.No precipitate formed.
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