Assertion : `FeCl_3` reacts with KCNS to give blood red colouration.
Reason : `FeCl_3` reacts with KCNS to form potassium ferro-ferricyanide.

Options

A. Assertion and reason both are correct statements and reason is correct explanation for assertion.
B. Assertion and reason both are correct statements but reason is not correct explanation for assertion.
C. Assertion is correct statement but reason is wrong statement.
D. Assertion is wrong statement but reason is correct statement

Answer

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

### Step 1: Understand the Assertion
The assertion states that `FeCl_3` reacts with `KCNS` to give a blood red coloration.

- **Chemical Reaction**: When `FeCl_3` (ferric chloride) reacts with `KCNS` (potassium thiocyanate), the product formed is `Fe(SCN)₃` (ferric thiocyanate).
- **Color**: Ferric thiocyanate is known to produce a blood red color in solution.

### Step 2: Verify the Reason
The reason states that `FeCl_3` reacts with `KCNS` to form potassium ferro-ferricyanide.

- **Chemical Reaction**: This statement is incorrect. The reaction does not produce potassium ferro-ferricyanide. Instead, it produces ferric thiocyanate, as mentioned earlier.
- **Conclusion**: The reason provided is false.

### Step 3: Final Conclusion
- The assertion is **true** because `FeCl_3` does react with `KCNS` to give a blood red coloration due to the formation of ferric thiocyanate.
- The reason is **false** because it incorrectly identifies the product of the reaction.

### Final Answer
- **Assertion**: True
- **Reason**: False