Which of the following does not give a precipitate with $CrO_4^{2-}$?

$Al^{3+}$,$Fe^{3+}$,$Zn^{2+}$,and $Ni^{2+}$ ions are present in an acidic solution. Excess of ammonium chloride $(NH_4Cl)$ solution is added followed by the addition of ammonium hydroxide $(NH_4OH)$ solution. The resulting precipitate will contain:

When $H_2S$ gas is passed through an $HCl$ solution containing $CuCl_2, HgCl_2, BiCl_3$,and $CoCl_2$,which of the following will not precipitate?

Which of the following compounds will not give a positive chromyl chloride test?

Which of the following reagents is used to detect the presence of $Fe^{3+}$ ions in a solution?

The ion that can be precipitated by $HCl$ as well as $H_2S$ is