Which of the following can be used instead of $NH_4Cl$ in the analysis of group $III$ radicals?

In the group analysis of cations, $Ba^{2+}$ and $Ca^{2+}$ are precipitated respectively as

Identify the inorganic sulphides that are yellow in colour $ : $
$(A)$ $(NH_4)_2S$
$(B)$ $PbS$
$(C)$ $CuS$
$(D)$ $As_2S_3$
$(E)$ $As_2S_5$
Choose the correct answer from the options given below $ : $

How do we differentiate between $Fe^{3+}$ and $Cr^{3+}$ in group $III$?

Which of the following salts gives a white precipitate with $AgNO_3$ and dilute $H_2SO_4$,and also gives a green flame test?

Which of the following ions forms a white precipitate upon the addition of $HCl$ to its aqueous solution?