When sodium nitroprusside is added to an alkaline solution containing sulfide ions,a ........ is obtained.

Which of the following is soluble in yellow ammonium sulphide?

Which ion will form a precipitate with both $HCl$ and $H_2S$?

Which of these reactions is correct?

Of the following sulphides,which one is insoluble in dilute acids but soluble in alkalies?

Among $Fe^{3+}$, $Pb^{2+}$, $Cu^{2+}$, and $Mn^{2+}$, identify the one that gets precipitated out while passing $H_2S$ gas in the presence of $NH_4OH$ as a group reagent. The highest possible oxidation state of the corresponding metal is: