Assertion : In froth floatation method, collectors such as pine oil or xanthates are added to the suspension of powdered ore.
Reason : Collectors stabilise the froth.

Options

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

Explanation

To solve the question, we need to analyze the assertion and the reason provided, and determine their validity in the context of the froth flotation method.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that in the froth flotation method, collectors such as pine oil or xanthates are added to the suspension of powdered ore.
- **Analysis**: This is true. In froth flotation, collectors are indeed used to enhance the hydrophobic properties of the ore particles, allowing them to attach to air bubbles and rise to the surface.

2. **Understanding the Reason**:
- The reason states that collectors stabilize the froth.
- **Analysis**: This statement is misleading. While collectors do help in making the ore particles hydrophobic, it is the froth stabilizers (like pine oil) that actually stabilize the froth. Collectors enhance the separation process but do not directly stabilize the froth.

3. **Conclusion**:
- Since the assertion is true but the reason is false, we conclude that the correct relationship is that the assertion is correct, but the reason is incorrect.

4. **Final Answer**:
- The correct option is C: Assertion is true, but the reason is false.