Assertion (A) Permanganate titrations in the presence of HCL are unsatisfactory.
( R) HCI) is oxidised to chlorine.

Options

A. Both Assertion and Reason are correct explanation of the Assertion
B. Both Assertion and Reason are correct but Reason is not the correct explanation of Assertion
C. Assertion is correct but Reason is incorrect
D. Both Assertion and Reason are incorrect

Answer

To solve the assertion and reason question regarding permanganate titrations in the presence of HCl, we can break it down into the following steps:

### Step 1: Understand the Assertion
The assertion states that "Permanganate titrations in the presence of HCl are unsatisfactory." This means that when using potassium permanganate (KMnO4) as a titrant in an acidic medium provided by hydrochloric acid (HCl), the results of the titration are not reliable or satisfactory.

**Hint**: Consider why the presence of HCl might affect the reliability of the titration.

### Step 2: Analyze the Reason
The reason given is "HCl is oxidized to chlorine." This indicates that during the titration, HCl undergoes a chemical change where it is oxidized, producing chlorine gas (Cl2). This reaction can interfere with the intended reaction of KMnO4, which is supposed to oxidize the analyte (the substance being titrated).

**Hint**: Think about how the oxidation of HCl to chlorine might consume KMnO4 and affect the titration.

### Step 3: Reaction Mechanism
When KMnO4 is added to an acidic solution containing HCl, the following reaction occurs:
\[ \text{KMnO}_4 + \text{HCl} \rightarrow \text{KCl} + \text{MnCl}_2 + \text{Cl}_2 + \text{H}_2\text{O} \]
In this reaction, the KMnO4 is being used to oxidize HCl to Cl2, rather than oxidizing the intended analyte. This results in a depletion of KMnO4, leading to inaccurate titration results.

**Hint**: Visualize the chemical reaction and how the products affect the titration.

### Step 4: Conclusion on Assertion and Reason
Since both the assertion and the reason are correct, and the reason provides a valid explanation for the assertion, we conclude that:
- The assertion is true: Permanganate titrations in the presence of HCl are indeed unsatisfactory.
- The reason is also true: HCl is oxidized to chlorine, which interferes with the titration.

Thus, the correct answer is that both the assertion and the reason are correct, and the reason is a correct explanation for the assertion.

**Final Answer**: Both assertion and reason are correct and the reason is the correct explanation for the assertion.