To which of the following ores , calcination process is not applicable

To which of the following ores , calcination process is not applicable
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To which of the following ores , calcination process is not applicable A. Zns B. `Al_(2)O_(3)2H_(2)O` C. `CuCO_(3).Cu(OH)_(2)` D. `CaCO_(3)`
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Which state is the largest producer of manganese ores in India? -SST 10th

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What does Ores mean ?

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