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B
Mn3O4
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C
NiAs
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D
Cu(OH)2CuCO3
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Solution
The correct option is CCu(OH)2CuCO3 Fe3O4 is magnetite. Mn3O4 is hausmannite. NiAs ia an allot. It is not an ore. The formula of malachite ore is Cu(OH)2CuCO3.