Question
Chemistry Question on General Principles and Processes of Isolation of Elements
Which of the following ore is not in oxide form?
Malachite
Haematite
Magnetite
Zincite
Malachite
Solution
The correct answer is option (A): Malachite
Malachite is a copper carbonate hydroxide mineral ore. It is sticking green and has a banded pattern, making it attractive. The chemical formula for malachite is Cu2CO3(OH)2. It is the ore for secondary copper minerals. Malachite has a perfect cleavage, that is it can be split into thin sheets. Due to the pattern and beautiful color, it is widely used as ornamental items. Apart from this, all the given ores are oxides. Hematite is an iron oxide with a chemical formula of Fe2O3. Magnetite is an iron oxide ore with the chemical formula as Fe3O4. It is the most common and important iron ore. Zincate generally contain zinc oxide (ZnO).