A ore can be reduced to its respective oxide ore by .

nitrate

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hydroxide

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roasting

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calcination

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Solution

The correct options are
B hydroxide
C roasting
D calcination
Calcination is the process of converting a concentrated ore to its respective oxide, by heating it in the absence of air below its melting point. This is generally done on concentrated carbonate or hydroxide ores. For example,
$2Al {(OH)}_{3} (s) \to {Al}_{2} O_{3} (s) + 3 H_{2} O (l)$ ${CaCO}_{3} (s) \to CaO (s) + {CO}_{2} (g)$

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