Identify the correct statements:

Options

A. iron belongs to first transition series of the periodic table
B. The purest form of commerical iron is wrought iron
C. Anhydrous ferrous sulphate is called as yellow vitriol
D. Iron is the most aboundant transition metal

Answer

To solve the question of identifying the correct statements regarding iron and its properties, we can analyze each statement one by one. Here’s a step-by-step breakdown:

### Step 1: Analyze the First Statement
**Statement:** Iron belongs to the first transition series of the periodic table.

**Explanation:** Iron (Fe) is indeed part of the first transition series, which includes elements from Scandium (Sc) to Zinc (Zn). Iron is located in the 4th period and is in group 8 of the periodic table.

**Conclusion:** This statement is **correct**.

### Step 2: Analyze the Second Statement
**Statement:** The purest form of commercial iron is wrought iron.

**Explanation:** Wrought iron is known for its malleability and is considered one of the purest forms of iron, containing a very low amount of carbon (typically between 0.12% and 0.25%).

**Conclusion:** This statement is **correct**.

### Step 3: Analyze the Third Statement
**Statement:** Anhydrous ferrous sulphate is called yellow vitriol.

**Explanation:** This statement is incorrect. Hydrated ferrous sulfate (FeSO₄·7H₂O) is known as green vitriol, while anhydrous ferrous sulfate (FeSO₄) is actually white in color.

**Conclusion:** This statement is **incorrect**.

### Step 4: Analyze the Fourth Statement
**Statement:** Iron is the most abundant transition metal, occurring in the earth's crust to the extent of 4.5%.

**Explanation:** Iron is indeed the most abundant transition metal found in the Earth's crust, with an abundance of approximately 4.5%.

**Conclusion:** This statement is **correct**.

### Final Summary of Correct Statements
Based on the analysis:
- The first statement is correct.
- The second statement is correct.
- The third statement is incorrect.
- The fourth statement is correct.

Thus, the correct statements are the **1st, 2nd, and 4th**.