Which one of the following ores is known as Malachite:

Options

A. `Cu_(2)S`
B. `Cu_(2)O`
C. `Cu(OH)_(2).CuCO_(3)`
D. `CuFeS_(2)`

Answer

To determine which ore is known as Malachite, we will analyze the given options step by step.

### Step 1: Identify the Chemical Composition of Each Option
We have four options to consider:

1. **Cu2S** - This is known as Chalcocite.
2. **Cu2O** - This is known as Cuprite.
3. **Cu(OH)2·CuCO3** - This is known as Malachite.
4. **CuFeS2** - This is known as Chalcopyrite.

### Step 2: Analyze the Composition of Malachite
Malachite is a copper carbonate hydroxide mineral. Its chemical formula is **Cu(OH)2·CuCO3**. In its pure form, Malachite contains approximately **57.7% copper**.

### Step 3: Compare the Options
Now, let's summarize the information we have about each ore:

- **Cu2S (Chalcocite)**: Contains a high percentage of copper but is not Malachite.
- **Cu2O (Cuprite)**: Contains about 88.8% copper but is not Malachite.
- **Cu(OH)2·CuCO3 (Malachite)**: Contains about 57.7% copper and is indeed Malachite.
- **CuFeS2 (Chalcopyrite)**: Contains about 34.5% copper but is not Malachite.

### Step 4: Conclusion
Based on the analysis, the ore that is known as Malachite is **Cu(OH)2·CuCO3**.

### Final Answer
The correct answer is **Cu(OH)2·CuCO3**, which is Malachite.

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