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Clay, cryolite and Bauxite are the miner...

Clay, cryolite and Bauxite are the minerals of Aluminium.
a) Which one these is an ore of Aluminium? Write the chemical formula
b) What should be the properties of an ore?

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a) Bauxite, (Al_2O_3, 2H_2O)
b) 5. Metallurgical process easier.
2. More economic
3. Easily available.
4. Greater metallic content
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