Mark the correct statements.
(i) Mercury can be refined by the process of distillation.
(ii) In poling, the molten impure metal is stirred with green poles of wood.
(iii) In electrolytic refining of metals , impure metal is made as cathode and a thin strip of pure metal is made as anode.

Options

A. (i) and (ii)
B. (i) and (iii)
C. (ii) and (iii)
D. (i), (ii) and (iii)

Explanation

To solve the question, we need to evaluate each of the three statements regarding the refining processes of metals and determine which ones are correct.

### Step 1: Analyze Statement (i)
**Statement:** Mercury can be refined by the process of distillation.

**Analysis:**
- Distillation is a method used to separate substances based on their boiling points. Mercury has a low boiling point compared to many other metals, making distillation an effective method for its refinement. Therefore, this statement is correct.

### Step 2: Analyze Statement (ii)
**Statement:** In poling, the molten impure metal is stirred with green poles of wood.

**Analysis:**
- Poling is a refining process used to remove impurities from molten metals, particularly when metallic oxides are present. Green wood is used because it does not burn easily compared to dry wood, which would combust in the heat of the molten metal. Thus, this statement is also correct.

### Step 3: Analyze Statement (iii)
**Statement:** In electrolytic refining of metals, impure metal is made as cathode and a thin strip of pure metal is made as anode.

**Analysis:**
- In electrolytic refining, the impure metal is actually used as the anode, while a thin strip of pure metal serves as the cathode. The process involves dissolving the impure metal at the anode and depositing pure metal at the cathode. Therefore, this statement is incorrect.

### Conclusion:
- The correct statements are:
- (i) Mercury can be refined by the process of distillation. **(Correct)**
- (ii) In poling, the molten impure metal is stirred with green poles of wood. **(Correct)**
- (iii) In electrolytic refining of metals, impure metal is made as cathode and a thin strip of pure metal is made as anode. **(Incorrect)**

### Final Answer:
The correct statements are (i) and (ii).

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