Question

Thomas slag is:
A. ${\text{CaSi}}{{\text{O}}_{\text{3}}}$
B. ${\text{C}}{{\text{a}}_3}{\left( {{\text{P}}{{\text{O}}_4}} \right)_2}$
C. ${\text{MnSi}}{{\text{O}}_{\text{3}}}$
D. ${\text{CaC}}{{\text{O}}_{\text{3}}}$
E. none of the above

Answer 1

To answer this question we should remember the formula of Thomas slag. Thomas slag is a tetra calcium phosphorous nonaoxide. It is a white powder. It is a very basic calcium phosphate. This slag is rich in phosphate content.

Complete step-by-step answer:
Copper pyrite ${\text{CuFe}}{{\text{S}}_2}$ is the ore of copper. From this ore, copper metal is separated by converting the ore into oxide by the roasting process the then roasted ore is reduced by heating with sand and cock in the reverberatory furnace, where, iron impurity removes as slag ${\text{CaSi}}{{\text{O}}_{\text{3}}}$leaving behind the copper sulphide which is known as copper matte.

The tetra calcium phosphate is known as Thomas slag. The chemical formula of Thomas slag is ${\text{C}}{{\text{a}}_{\text{4}}}{{\text{(P}}{{\text{O}}_{\text{4}}}{\text{)}}_{\text{2}}}{\text{O}}$ . It is used as a phosphorus fertilizer because it is soluble in water and contains a high amount of phosphorus.
${\text{MnSi}}{{\text{O}}_{\text{3}}}$ is a silicate having manganese. The manganese silicon silicate ${\text{MnSi}}{{\text{O}}_{\text{3}}}$ is known as pyroxmangite. It is a mineral mainly found in Japan.
${\text{CaC}}{{\text{O}}_{\text{3}}}$ is known as calcium carbonate. It is found in rocks as a mineral known as calcite.So, none of the above given compounds represent the Thomas slag is.

Therefore, option (E) none of the above, is correct.

Note: Thomas slag is a mixture of tri-calcium phosphate ${\text{C}}{{\text{a}}_3}{\left( {{\text{P}}{{\text{O}}_4}} \right)_2}$and calcium silicon dioxide${\text{CaSi}}{{\text{O}}_2}$. It is obtained in the Thomas- Gilchrist process as a fine powder. It is a basic slag. Its crystal structure is monoclinic. The hydrolysis of Thomas slag gives hydroxyapatite and calcium hydroxide. Calcium carbonate is also known as calcite, lime, chalk, limestone, marble, pearl, etc.