Among $PbS,CuS,HgS,MnS,A{g}_{2}S,NiS,CoS,B{i}_2{S}_3$ and $Sn{S}_2$, the total number of black coloured sulphides is

Q. Among $PbS,CuS,HgS,MnS,A{g}_{2}S,NiS,CoS,B{i}_2{S}_3$ and SnS${}_2$, the total number of black coloured sulphides are:

Q. Group II and Group IV cations are precipitated as their sulphides in Qualitative analysis. How many of the following sulphides are yellow in colour?
$A{g}_{2}S,PbS,HgS,CuS,A{s}_2{S}_3,A{s}_2{S}_5,Sn{S}_2,CdS,S{b}_2{S}_3,ZnS,SnS$

Q. The solubility product of $CuS,{Ag}_{2}S$ and $HgS$ are ${10}^{-37},{10}^{-44}$ and ${10}^{-54}$ respectively. The solubility of these sulphides will be in the order:

Q. Which among the following compound is a white coloured precipitate? ___
$PbC{l}_2,H{g}_{2}C{l}_2,Al(OH{)}_3,ZnS,HgS,Sn{S}_2,CdS,SrC{O}_3,BaC{O}_3$

Q. Out of the following $X$ is number of salts which have yellow or orange colour precipitates. Then value of $X^2$ is
$CdS,ZnS,A{s}_2{S}_3,A{s}_2{S}_5,CoS,BaC{O}_3,PbS,Sn{S}_2,AgI,Pb{I}_2$