Which of the following is a hydrated oxide mineral?

Zincite

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Cassiterite

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Bauxite

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Haematite

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Solution

The correct option is D Bauxite
Bauxite is an aluminium ore and is the main source of aluminium. This form of rock consists mostly of the minerals gibbisite $A l (O H)_{3}$ , boehmite - $A l O (O H)$ and diaspore - $A l O (O H)$ ,

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