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Question:

Which one is malachite from the following?

Fe3O4

CuCO3.Cu(OH)2

CuFeS2

Cu(OH)2

Solution:

Correct option is CuCO3.Cu(OH)2. Malachite is a mineral of copper. It is a copper carbonate hydroxide mineral. It has a molecular formula CuCO3.Cu(OH)2. So, the correct answer is "Option B".