Question

In extraction of metal how many of the following ores involve a calcinations process.
A. Dolomite
B. Malachite
C. Calcite
D. Copper pyrites
E. Cryolite
F. Siderite
G. Iron pyrite
H. Argentite

Answer 1

Hint: Calcination process is a process of conversion of ores into oxides by heating strongly in absence or a very limited supply of air. The volatile impurities as well as organic matter and moisture are removed by this process.

Complete Step by Step Answer:
Calcination can be described as a process of heating some solid material or a substance in a controlled environment . Usually in the process, the temperature is also regulated . Calcination is done to bring about some change in the substance's physical or chemical constitution. During calcinations solids are heated at strongly elevated temperatures. This is done to mainly remove the volatile substances , water or oxidise the substance. And so sometimes it is also called the purification process.

The word calcinations is also derived from the Latin word Calcinate which means “to burn lime”. Hence , coming on the options given we can see that the ores like Dolomite which has the chemical formula as$A{{g}_{2}}S$ $MgC{{O}_{3}}.CaC{{O}_{3}}$ and that of Malachite which is an ore of copper has the formula as $Cu{{(OH)}_{2}}CuC{{O}_{3}}$ .

Other given options has the ores and formula as:
Calcite: it is a carbonate ore and has the formula as $CaC{{O}_{3}}$
Copper pyrite: formula is $CuFe{{S}_{2}}$
Cryolite: formula is $N{{a}_{3}}Al{{F}_{6}}$
Siderite: formula is $FeC{{O}_{3}}$
Iron pyrite: formula is $Fe{{S}_{2}}$
Argentite: formula is $A{{g}_{2}}S$

Now as we know that in the calcination process are used and here in the options we can interpret that the ores which involve this process will be A,C,E,H as the correct answers.
Hence, options A, C, E, and H are the correct answers.

Note: In the calcinations process mainly only carbonated ores are used for the calcinations process and undergoes it in the limited supply of air to convert them into oxides .