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Assetion : Permanganate titrations is no...

Assetion : Permanganate titrations is not carried out in presence of hydrochloric acid.
Reason : Hydrochloric acid is oxidised to chlorine.

A

STATEMENT-1 is true, STATEMENT-2 is true and STATEMENT-2 is correct explanation for STATEMENT-1.

B

STATEMENT-1 is true, STATEMENT-2 is true and STATEMENT-2 is not correct explanation for STATEMENT-1.

C

STATEMENT-1 is true, STATEMENT-2 is false

D

STATEMENT-1 is false, STATEMENT-2 is true

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question regarding the assertion and reason about permanganate titrations and hydrochloric acid, we can break it down into a step-by-step analysis. ### Step 1: Understand the Assertion The assertion states that permanganate titrations are not carried out in the presence of hydrochloric acid (HCl). This implies that there is a specific reason why HCl is unsuitable for this type of titration. **Hint:** Consider the chemical behavior of permanganate ions in acidic solutions. ### Step 2: Analyze the Reason The reason given is that hydrochloric acid is oxidized to chlorine. This suggests that when HCl is present, it undergoes a chemical reaction that produces chlorine gas. **Hint:** Think about the redox reactions involving permanganate ions (MnO4-) and how they interact with acids. ### Step 3: Identify the Reaction When permanganate ions (KMnO4) are added to an acidic solution containing HCl, a redox reaction occurs. The MnO4- ions are reduced, while the HCl is oxidized to chlorine gas (Cl2). The balanced chemical equation for this reaction is: \[ \text{MnO}_4^- + 8 \text{H}^+ + 5 \text{Cl}^- \rightarrow \text{Mn}^{2+} + 4 \text{H}_2\text{O} + 5 \text{Cl}_2 \] **Hint:** Write down the half-reactions to see how the oxidation and reduction processes occur. ### Step 4: Consequences of the Reaction The formation of chlorine gas during the titration can interfere with the endpoint determination. The presence of chlorine alters the expected color change associated with the titration, leading to inaccuracies. **Hint:** Consider what happens to the indicator used in the titration when chlorine is produced. ### Step 5: Conclusion on Assertion and Reason Since both the assertion (permanganate titrations are not carried out in the presence of HCl) and the reason (HCl is oxidized to chlorine) are true, and the reason correctly explains why the assertion is true, we conclude that both statements are valid. **Hint:** Reflect on the relationship between the assertion and reason to confirm their validity. ### Final Answer Both the assertion and the reason are true, and the reason is the correct explanation for the assertion. ### Summary of Steps: 1. Understand the assertion about permanganate titrations. 2. Analyze the reason regarding the oxidation of HCl. 3. Identify the chemical reaction that occurs. 4. Discuss the consequences of the reaction on the titration process. 5. Conclude the validity of both statements.

To solve the question regarding the assertion and reason about permanganate titrations and hydrochloric acid, we can break it down into a step-by-step analysis. ### Step 1: Understand the Assertion The assertion states that permanganate titrations are not carried out in the presence of hydrochloric acid (HCl). This implies that there is a specific reason why HCl is unsuitable for this type of titration. **Hint:** Consider the chemical behavior of permanganate ions in acidic solutions. ### Step 2: Analyze the Reason ...
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