Which of the following statements is incorrect?

Options

A. Calamine and siderite are carbonates
B. Argentite and cuprite are oxides
C. Zinc blende and pyrites are sulphides.
D. Malachite and azurite are ores of copper

Answer

To solve the question of identifying the incorrect statement among the given options, we can follow these steps:

### Step 1: Analyze the First Statement
The first statement claims that calamine and siderite are carbonates.

- **Calamine**: The chemical formula is ZnCO₃, which is indeed a carbonate.
- **Siderite**: The chemical formula is FeCO₃, which is also a carbonate.

**Conclusion**: This statement is correct.

### Step 2: Analyze the Second Statement
The second statement claims that argentite and cuprite are oxides.

- **Argentite**: The chemical formula is Ag₂S, which indicates that it is a sulfide, not an oxide.
- **Cuprite**: The chemical formula is Cu₂O, which is indeed an oxide.

**Conclusion**: This statement is incorrect because argentite is not an oxide.

### Step 3: Analyze the Third Statement
The third statement claims that zinc blend and pyrites are sulfides.

- **Zinc Blend**: The chemical formula is ZnS, which is a sulfide.
- **Pyrites**: The chemical formula is FeS₂, which is also a sulfide.

**Conclusion**: This statement is correct.

### Step 4: Analyze the Fourth Statement
The fourth statement claims that malachite and azurite are ores of copper.

- **Malachite**: The chemical formula is CuCO₃·Cu(OH)₂, which is a copper ore.
- **Azurite**: The chemical formula is Cu₃(CO₃)₂(OH)₂, which is also a copper ore.

**Conclusion**: This statement is correct.

### Final Conclusion
After analyzing all the statements, we find that the second statement, "argentite and cuprite are oxides," is incorrect because argentite is a sulfide, not an oxide.

### Answer
The incorrect statement is: "argentite and cuprite are oxides."

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