Which one of the following scrap metal cannot be separated by magnetic separation ?

Options

A. (A)Haematite
B. (B)Malachite
C. (C)Magnetite
D. (D)Siderite

Explanation

To determine which scrap metal cannot be separated by magnetic separation, we need to analyze the options provided and identify the one that does not contain magnetic properties.

### Step-by-Step Solution:

1. **Understand Magnetic Separation**: Magnetic separation is a process that uses magnetic forces to separate magnetic materials from non-magnetic materials. This technique is commonly used in the mining industry to separate ores containing magnetic metals from those that do not.

2. **Identify the Options**: The options given are:
- A) Hematite (Fe2O3)
- B) Malachite (Cu2CO3(OH)2)
- C) Magnetite (Fe3O4)
- D) Siderite (FeCO3)

3. **Analyze Each Option**:
- **Option A: Hematite (Fe2O3)**: Hematite is an iron ore that contains iron, which is magnetic. Therefore, it can be separated by magnetic separation.
- **Option B: Malachite (Cu2CO3(OH)2)**: Malachite is a copper carbonate mineral and does not contain iron. Copper is not magnetic, so malachite cannot be separated by magnetic separation.
- **Option C: Magnetite (Fe3O4)**: Magnetite is another iron ore that contains a high percentage of iron and is strongly magnetic. It can be easily separated by magnetic separation.
- **Option D: Siderite (FeCO3)**: Siderite is also an iron ore, containing iron, and can be magnetically separated.

4. **Conclusion**: Based on the analysis, the only option that cannot be separated by magnetic separation is **B) Malachite**.

### Final Answer:
The scrap metal that cannot be separated by magnetic separation is **B) Malachite**.

---