Section E: Answer the case-based question given below.
37. Metals are required for a variety of purposes. For this we need their extraction from their ores. Ores mined from the earth are usually contaminated with many impurities which must be removed prior to the extraction of metals. The extraction of pure metal involves the following steps:
1. Concentration of ore
2. Extraction of the metal from the concentrated ore
3. Refining of the metal
2. Extraction of the metal from the concentrated ore
3. Refining of the metal
a. Name an ore of Mercury and state the form in which Mercury is present in it.
b. What happens to zinc carbonate when it is heated strongly in a limited supply of air?
b. What happens to zinc carbonate when it is heated strongly in a limited supply of air?
a. Ore of mercury:
An ore of mercury is . The chemical formula is \(HgS\) (mercury(II) sulfide). In cinnabar, mercury is present in the form of mercuric sulfide.
b. Heating zinc carbonate:
When zinc carbonate (\(ZnCO_3\)) is heated strongly in a limited supply of air, it undergoes thermal to form zinc oxide (\(ZnO\)) and carbon dioxide (\(CO_2\)).
\(ZnCO_3\) \(\overset{Heat}{\rightarrow}\) \(ZnO\) + \(CO_2\)