A: `[FeCN)_(6)]^(4-)` follows EAN rule.
R: Number of electrons in Fe in this complexionis 36

Options

A. If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1)
B. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2).
C. ) If Assertion is true statement but Reason is false, then mark (3).
D. If both Assertion and Reason are false statements, then mark (4)

Answer

To solve the question regarding the complex ion \([Fe(CN)_6]^{4-}\) and its adherence to the Effective Atomic Number (EAN) rule, we will follow these steps:

### Step 1: Determine the oxidation state of Iron (Fe) in the complex.
The formula for the complex is \([Fe(CN)_6]^{4-}\).

- Let the oxidation state of Iron be \(x\).
- The cyanide ion (CN) has a charge of \(-1\), and there are 6 cyanide ions, contributing a total charge of \(-6\).
- The overall charge of the complex is \(-4\).

Setting up the equation:
\[ x + 6(-1) = -4 \]
\[ x - 6 = -4 \]
\[ x = +2 \]

### Step 2: Determine the number of electrons in Iron (Fe) in its elemental state.
Iron (Fe) has an atomic number of 26, which means in its elemental state, it has 26 electrons.

### Step 3: Calculate the Effective Atomic Number (EAN).
The EAN is calculated using the formula:
\[ \text{EAN} = \text{Number of electrons in metal} + \text{Number of electrons donated by ligands} \]

- The oxidation state of Iron is +2, meaning it has lost 2 electrons from its elemental state:
\[ \text{Electrons in Fe} = 26 - 2 = 24 \]

- Each cyanide ion (CN) donates 2 electrons, and since there are 6 cyanide ions:
\[ \text{Electrons donated by ligands} = 6 \times 2 = 12 \]

Now, we can calculate the EAN:
\[ \text{EAN} = 24 + 12 = 36 \]

### Step 4: Compare EAN with the atomic number of the next noble gas.
The atomic number of the next noble gas after Iron (atomic number 26) is Krypton, which has an atomic number of 36.

Since the EAN of the complex \([Fe(CN)_6]^{4-}\) is 36, it matches the atomic number of Krypton.

### Conclusion:
Both statements A and R are correct:
- A: \([Fe(CN)_6]^{4-}\) follows the EAN rule.
- R: The number of electrons in Fe in this complex is 36.

### Final Answer:
Both statements A and R are correct.

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