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Question

Calcination is a process in which the ore is heated strongly in the absence of air to remove volatile impurities. It thermally decomposes the carbonate.
Al2O3.2H2OCalcination−−−−−−B+2H2O
The name of product B is:
  1. Corundum
  2. Bauxite
  3. Aluminum hydroxide
  4. None of these


Solution

The correct option is A Corundum
Al2O3.2H2OCalcination−−−−−−Al2O3+2H2O

Here, Al2O3 is called corundum.

Corundum is a crystalline form of aluminium oxide Al2O3 that usually contains traces of iron, titanium, vanadium, and chromium. It is a rock-forming mineral that is naturally transparent. Different transition metal impurities present in the structure could impart different colors. The mineral corundum has two principal gem varieties - sapphire and ruby. chromium impurities impart the deep red shade that characterizes rubies. On the other hand, sapphires could display a range of hues depending on the type of transition metal present in the structure. 

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