Assertion : Tin is refined by liquation method.
Reason : Tin has low melting point as compared to impurities .

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.

Answer

To solve the question regarding the assertion and reason about the refining of tin by the liquation method, we can break it down into the following steps:

### Step 1: Understand the Assertion
The assertion states that "Tin is refined by the liquation method." We need to confirm whether this statement is true.

### Step 2: Define the Liquation Method
The liquation method is a metallurgical process used to separate metals from their alloys or ores. It involves heating the mixture of metal and impurities to a temperature where the metal melts but the impurities do not.

### Step 3: Analyze the Reason
The reason given is "Tin has a low melting point as compared to impurities." We need to evaluate if this reason is valid and supports the assertion.

### Step 4: Compare Melting Points
Tin has a melting point of approximately 232°C. In contrast, many common impurities found in tin ores, such as oxides or silicates, have higher melting points. This means that when the mixture is heated, tin will melt and can be separated from the solid impurities.

### Step 5: Conclusion
Since the liquation method relies on the principle that the desired metal (tin) has a lower melting point than the impurities, the assertion is correct, and the reason provided correctly explains why the liquation method is applicable to tin.

### Final Answer
Both the assertion and the reason are correct, and the reason is a correct explanation for the assertion.