Assertion : Sodium chloride used to clear snow on the roads.
Reason : The alkaline solution of potassium dichromate contains `CrO_4^(2-)` ions.

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 analyze the given assertion and reason, we will break down the components step by step.

### Step 1: Understanding the Assertion
**Assertion:** Sodium chloride is used to clear snow on the roads.

- Sodium chloride (NaCl) is commonly used for de-icing roads during winter. When sprinkled on snow or ice, it lowers the freezing point of water, causing the ice to melt. This is due to a phenomenon known as freezing point depression, which occurs when a solute (in this case, NaCl) is added to a solvent (water).

**Conclusion for Step 1:** The assertion is correct because sodium chloride effectively melts snow and ice on roads.

### Step 2: Understanding the Reason
**Reason:** The alkaline solution of potassium dichromate contains `CrO4^(2-)` ions.

- Potassium dichromate (K2Cr2O7) is a chemical compound that, when dissolved in an alkaline solution, dissociates to form chromate ions (CrO4^(2-)). This transformation occurs because the dichromate ion (Cr2O7^(2-)) can convert into chromate ions in the presence of hydroxide ions (OH^-).

**Conclusion for Step 2:** The reason is also correct as potassium dichromate does produce chromate ions in an alkaline solution.

### Step 3: Analyzing the Relationship Between Assertion and Reason
- While both the assertion and the reason are correct, they are not directly related. The assertion discusses the use of sodium chloride for clearing snow, while the reason discusses the behavior of potassium dichromate in an alkaline solution. The reason does not explain why sodium chloride is used for de-icing.

### Final Conclusion
- **Assertion:** Correct
- **Reason:** Correct
- **Explanation Relationship:** The reason is not the correct explanation for the assertion.

### Answer
The assertion is correct, the reason is correct, but the reason is not the correct explanation for the assertion.

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