Froth floatation process is used for the concentration of the ore of :

Options

A. Fe
B. Al
C. Cr
D. Cu

Answer

To solve the question regarding which ore is concentrated using the froth flotation process, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Froth Flotation Process**:
The froth flotation process is a method used for the concentration of ores based on the differences in their surface properties. It is particularly effective for separating sulfide ores from gangue (the impurities).

**Hint**: Remember that froth flotation relies on the different affinities of ore and gangue for water and oil.

2. **Identify the Components**:
In the froth flotation process, a mixture of water and a frothing agent (like pine oil) is prepared. The crushed ore is added to this mixture.

**Hint**: Think about what happens to the ore particles when mixed with water and oil.

3. **Behavior of Ore and Gangue**:
In this process, the metal ore particles preferentially attach to the froth (oil) due to their hydrophobic nature, while the gangue particles remain in the water and settle at the bottom.

**Hint**: Focus on the properties of the ores mentioned in the question and their behavior in the flotation process.

4. **Analyze the Given Options**:
The options provided are:
- Fe (Iron)
- Al (Aluminum)
- Cr (Chromium)
- Cu (Copper)

We need to determine which of these metals is typically extracted from sulfide ores using the froth flotation method.

**Hint**: Recall that froth flotation is primarily used for sulfide ores.

5. **Identify the Relevant Metal**:
Among the options, copper (Cu) is known to be extracted from its sulfide ore (CuFeS2, chalcopyrite) using the froth flotation process. The other metals listed (Fe, Al, Cr) are not typically concentrated using this method.

**Hint**: Consider the common sulfide ores and their corresponding metals.

6. **Conclusion**:
Therefore, the froth flotation process is used for the concentration of the ore of copper (Cu).

**Final Answer**: The froth flotation process is used for the concentration of the ore of **Cu (Copper)**.