Select the incorrect statement of the following.

Options

A. Aluminium is often used as reducing agent for libration of other metals from their oxides.
B. Anthydrous `AlCl_3` can be prepared by treating `Al_(2)O_(3)` with coke and chlorine gas.
C. Aluminium readily dissolves in both dilute as well as in concentrated nitric acid.
D. Aluminium hydroxide is soluble in both aqueous alkali and acids indicating its amphoteric nature.

Answer

To solve the question of selecting the incorrect statement regarding aluminium and its properties, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Statement 1**: "Aluminium is often used as a reducing agent for liberation of other metals from their oxides."
- **Analysis**: This statement is true. Aluminium has a strong affinity for oxygen and can reduce less electropositive metals from their oxides. For example, it can reduce iron(III) oxide to iron.
- **Conclusion**: This statement is correct.

2. **Statement 2**: "Anhydrous AlCl3 can be prepared by treating Al2O3 with coke and chlorine gas."
- **Analysis**: This statement is also true. Aluminium oxide (Al2O3) can react with coke (carbon) and chlorine gas to produce anhydrous aluminium chloride (AlCl3).
- **Conclusion**: This statement is correct.

3. **Statement 3**: "Aluminium readily dissolves in both dilute as well as concentrated nitric acid."
- **Analysis**: This statement is incorrect. Aluminium does not react with nitric acid (HNO3) due to the formation of a protective oxide layer on its surface. This applies to both dilute and concentrated nitric acid.
- **Conclusion**: This statement is incorrect.

4. **Statement 4**: "Aluminium hydroxide is soluble in both aqueous alkali and acids indicating its amphoteric nature."
- **Analysis**: This statement is true. Aluminium hydroxide (Al(OH)3) is amphoteric, meaning it can react with both acids and bases, thus showing solubility in both.
- **Conclusion**: This statement is correct.

### Final Answer:
The incorrect statement is **Statement 3**: "Aluminium readily dissolves in both dilute as well as concentrated nitric acid."