Among $PbS$,$CuS$,$HgS$,$MnS$,$Ag_2S$,$NiS$,$CoS$,$Bi_2S_3$,and $SnS_2$,the total number of black coloured sulphides is

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?

In the wet tests for identification of various cations by precipitation,which transition element cation does not belong to group $IV$ in qualitative inorganic analysis?

What color does lead acetate give with $H_2S$?

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

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