Assertion. Carbonate and hydroxide ores are concentrated by froth floatation process.
Reason. In froth floatation process, mineral oil is used because it perferentially wets the gangue particles.

Options

A. If both assertion and reason are true, and reason is not the true explanation of the assertion.
B. If both assertion and reason are true, but reason is not the true explanation of the assertion.
C. If assertion is true, but reason is false
D. If both assertion and reason are false

Explanation

To solve the assertion-reason question, we need to analyze both the assertion and the reason provided.

### Step 1: Analyze the Assertion
The assertion states that "Carbonate and hydroxide ores are concentrated by froth flotation process."

- **Understanding Froth Flotation**: The froth flotation process is primarily used for the concentration of sulfide ores, not carbonate or hydroxide ores. In this process, the ore is mixed with water and a frothing agent, and air is introduced to create bubbles. The sulfide minerals attach to the bubbles and rise to the surface, forming a froth that can be skimmed off.

**Conclusion**: The assertion is **false**.

### Step 2: Analyze the Reason
The reason states that "In froth flotation process, mineral oil is used because it preferentially wets the gangue particles."

- **Understanding the Role of Mineral Oil**: In the froth flotation process, mineral oil (often pine oil) is used to preferentially wet the sulfide minerals, not the gangue particles. The gangue particles are typically wetted by water. The oil helps the sulfide minerals to attach to the air bubbles and rise to the surface.

**Conclusion**: The reason is also **false**.

### Step 3: Final Conclusion
Since both the assertion and the reason are false, the correct answer is that both statements are incorrect.

### Final Answer:
Both the assertion and the reason are false.

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