Question

Identify the incorrect statement from the following.

• A. The IUPAC name of element with atomic number 107 is Unnilseptium.
• B. The oxidation state and covalency of aluminium in \([Al(H_2O)_6]^{3+}\) are \(+3\) and \(6\), respectively.
• C. Common oxidation states of aluminium are \(+1\) and \(+3\).
• D. Functional similarities in the behaviour of lithium with magnesium are referred to as diagonal relationship.

Hint:

Aluminium commonly shows \(+3\) oxidation state. Lithium and magnesium show diagonal relationship.

Answer 1

The Correct Option is C

Step 1: Check statement (A).
The older temporary IUPAC name for element \(107\) was Unnilseptium. The present name is Bohrium. So the statement may be considered correct in the old temporary naming context.

Step 2: Check statement (B).
In: \[ [Al(H_2O)_6]^{3+} \] Water is a neutral ligand. The charge on the complex is: \[ +3 \] So oxidation state of Al is: \[ +3 \] There are six water ligands attached to aluminium. So covalency or coordination number is: \[ 6 \] Thus statement (B) is correct.

Step 3: Check statement (C).
Aluminium most commonly shows: \[ +3 \] oxidation state. The \(+1\) oxidation state is not a common oxidation state of aluminium. Therefore, the statement saying that common oxidation states are \(+1\) and \(+3\) is incorrect.

Step 4: Check statement (D).
Lithium and magnesium show similarities due to diagonal relationship. So statement (D) is correct. Therefore, the incorrect statement is: \[ \text{Common oxidation states of aluminium are }+1\text{ and }+3. \]