Question

Among ${\text{PbS,}}\,{\text{CuS,}}\,{\text{HgS,}}\,{\text{MnS,}}\,{\text{A}}{{\text{g}}_{\text{2}}}{\text{S,}}\,{\text{NiS,}}\,{\text{CoS,}}\,{\text{B}}{{\text{i}}_{\text{2}}}{{\text{S}}_{\text{3}}}$and ${\text{Sn}}{{\text{S}}_{\text{2}}}$the total number of black coloured sulphides are:
A) $6$
B) $7$
C) $8$
D) $9$

Answer 1

Hint : Sulphide is a sulphur inorganic anion with the chemical formula ${{\text{S}}^{{\text{2 - }}}}$ or a compound containing one or more ${{\text{S}}^{{\text{2 - }}}}$ ions. ${{\text{H}}_{\text{2}}}{\text{S}}$ reacts with ${\text{CuC}}{{\text{l}}_{\text{2}}}$ to produce a black sulphide. Sulphide salt solutions are corrosive. Large families of inorganic and organic compounds, such as lead sulphide and dimethyl sulphide, are classified as sulphides.

Complete Step By Step Answer:
There are a total of six black coloured sulphides. This includes the following:
${\text{PbS,}}\,{\text{CuS,}}\,{\text{HgS,}}\,{\text{NiS,}}\,{\text{CoS,}}\,{\text{B}}{{\text{i}}_{\text{2}}}{{\text{S}}_{\text{3}}}{\text{.}}$
${\text{PbS}}\,{\text{:}}$
Lead (II) sulphide is a black-colored inorganic compound with the formula ${\text{PbS}}$. Galena is the most common ore and the most effective lead compound. It's a semiconducting substance with specific applications.
${\text{CuS :}}$
Copper monosulfide is a black-colored chemical compound made up of copper and sulphur.
${\text{HgS}}$:
Mercury (II) sulphide, is a black crystalline solid that is primarily used as a pigment in paints, rubber, and plastics.
${\text{NiS}}$:
Nickel sulphide has the formula ${\text{NiS}}$ and is an inorganic compound. It's a black solid made from nickel (II) salts treated with hydrogen sulphide.
${\text{CoS}}$:
Chemical compounds with the formula $C{o_x}{S_y}$are known as cobalt sulphide. Cobalt sulphides are black, semiconducting, insoluble in water, and nonstoichiometric in nature.
$B{i_2}{S_3}:$
Bismuth (III) sulphide is a black-coloured chemical compound of bismuth and sulphur. Bismuthinite is the mineral type of bismuth.
The crystalline form of $B{i_2}{S_3}$ is dark brown, but the precipitate obtained is black.
Hence, the total number of black coloured sulphides are $6$.

Note :
Solid sulphides are formed when aqueous solutions of transition metal cations react with sulphide sources. Many of these inorganic sulphides are bound to minerals of similar compositions and have a poor solubility in water.