Which statements is correct regarding the diagonal relationship between the Al and Be?

Options

A. `BeO and Al_(2)O_(3)` are amphoteric in nature
B. Both carbide on hydrolysis produce same gas
C. Both can form complex
D. Both have nearly close m.p.

Answer

To determine which statements are correct regarding the diagonal relationship between Aluminum (Al) and Beryllium (Be), we will analyze each statement one by one.

### Step 1: Analyze the first statement
**Statement:** Beryllium oxide and Aluminum oxide are amphoteric in nature.

**Solution:**
- Amphoteric substances can react with both acids and bases.
- **Beryllium oxide (BeO)** reacts with hydrochloric acid (HCl):
\[ \text{BeO} + 2 \text{HCl} \rightarrow \text{BeCl}_2 + \text{H}_2\text{O} \]
- **Beryllium oxide** also reacts with sodium hydroxide (NaOH):
\[ \text{BeO} + 2 \text{NaOH} + 2 \text{H}_2\text{O} \rightarrow \text{Na}_2\text{Be(OH)}_4 \]
- **Aluminum oxide (Al2O3)** reacts with hydrochloric acid:
\[ \text{Al}_2\text{O}_3 + 6 \text{HCl} \rightarrow 2 \text{AlCl}_3 + 3 \text{H}_2\text{O} \]
- **Aluminum oxide** also reacts with sodium hydroxide:
\[ \text{Al}_2\text{O}_3 + 2 \text{NaOH} + 3 \text{H}_2\text{O} \rightarrow 2 \text{NaAl(OH)}_4 \]
- Both oxides are amphoteric, so this statement is **correct**.

### Step 2: Analyze the second statement
**Statement:** Both carbides on hydrolysis produce the same gases.

**Solution:**
- **Aluminum carbide (Al4C3)** hydrolysis:
\[ \text{Al}_4\text{C}_3 + 12 \text{H}_2\text{O} \rightarrow 4 \text{Al(OH)}_3 + 3 \text{CH}_4 \]
- **Beryllium carbide (Be2C)** hydrolysis:
\[ \text{Be}_2\text{C} + 4 \text{H}_2\text{O} \rightarrow 2 \text{Be(OH)}_2 + \text{CH}_4 \]
- Both reactions produce methane (CH4) as a gas. Therefore, this statement is **correct**.

### Step 3: Analyze the third statement
**Statement:** Both can form complexes.

**Solution:**
- **Beryllium complex:** Sodium beryllium hydroxide complex is Na2Be(OH)4.
- **Aluminum complex:** Sodium aluminate complex is NaAl(OH)4.
- Both elements can form complexes, so this statement is **correct**.

### Step 4: Analyze the fourth statement
**Statement:** Both have nearly high close melting points.

**Solution:**
- **Melting point of Beryllium (Be):** 1287 °C
- **Melting point of Aluminum (Al):** 663 °C
- The melting point of Beryllium is significantly higher than that of Aluminum, indicating that they do not have nearly close melting points. Therefore, this statement is **incorrect**.

### Conclusion:
- The correct statements regarding the diagonal relationship between Aluminum and Beryllium are:
- Statement 1: Correct
- Statement 2: Correct
- Statement 3: Correct
- Statement 4: Incorrect

Thus, the correct statements are A, B, and C, while D is incorrect.

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