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

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 $ : $

$A \xrightarrow{ K_4[Fe(CN)_6] } \text{Blue-white precipitate}$. Which ion is $A$?

What color does lead acetate give with $H_2S$?

On passing $H_2S$ gas,a black precipitate of $II$ group is obtained. The mixture may not contain:

Which of these reactions is correct?