In the following question, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices:

Assertion : CuFeS₂ is concentrated by froth floatation process.

Reason: CuFeS₂ is the main ore of copper. 

Both assertion and reason are true but the reason is not the correct explanation of the assertion.

The correct answer is option 2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.

Assertion: \(CuFeS_2\) (chalcopyrite) is indeed concentrated by the froth flotation process.

Reason: While \(CuFeS_2\) is a significant ore of copper, being the main ore isn't the sole reason for using froth flotation.

Froth flotation is a versatile technique used to concentrate sulfide ores based on their physical properties, particularly their hydrophobicity (water repellency). \(CuFeS_2\) particles are hydrophobic, allowing them to attach to air bubbles and float to the top of the flotation cell during the process. This separation works regardless of whether \(CuFeS_2\) is the main copper ore or not.

Even though \(CuFeS_2\) is an important copper ore, other copper sulfide ores can also be concentrated using froth flotation. The key factor is the suitability of the ore for this separation method based on its surface properties.