Which statement is not correct for nitrogen?

Options

A. it is obtained by heating `(NH_(4))_(2)Cr_(2)O_(7)`
B. It does not readily react with `O_(2)`
C. It is a typical non-metal
D. `d`-orbitals are available for bonding

Answer

To determine which statement is not correct for nitrogen, we will analyze each statement one by one.

### Step 1: Analyze the First Statement
**Statement:** "It is obtained by heating NH4 whole twice Cr2O7."

- When ammonium dichromate \((NH_4)_2Cr_2O_7\) is heated, it decomposes to produce nitrogen gas \((N_2)\), chromium(III) oxide \((Cr_2O_3)\), and water \((H_2O)\).
- The reaction can be summarized as:
\[ (NH_4)_2Cr_2O_7 \rightarrow N_2 + Cr_2O_3 + 4H_2O \]
- Since nitrogen gas is indeed produced from this reaction, this statement is **correct**.

### Step 2: Analyze the Second Statement
**Statement:** "It does not readily react with O2."

- Nitrogen gas \((N_2)\) has a strong triple bond between the nitrogen atoms, which requires a significant amount of energy to break.
- Due to this high bond dissociation energy, nitrogen does not readily react with oxygen under normal conditions.
- Therefore, this statement is also **correct**.

### Step 3: Analyze the Third Statement
**Statement:** "It is a typical nonmetal."

- Nitrogen, with an atomic number of 7, has the electronic configuration of \(1s^2 2s^2 2p^3\).
- It has five valence electrons and tends to gain or share electrons to achieve a stable octet, which is characteristic of nonmetals.
- Thus, this statement is also **correct**.

### Step 4: Analyze the Fourth Statement
**Statement:** "D orbitals are available for bonding."

- Nitrogen is in the second period of the periodic table, and elements in this period do not have d orbitals available for bonding.
- Therefore, this statement is **incorrect**.

### Conclusion
The statement that is not correct for nitrogen is: **"D orbitals are available for bonding."**

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