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B
Al2O3.H2O
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C
AlCl3.AI2O3
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D
MgCl2.CaCl2
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Solution
The correct option is DFe2O3 Fe2O3 is a common impurity in bauxite, especially red bauxite. The red colour of this kind of bauxite ore is also due to this impurity which itself is reddish brown in colour.