4
2
3
5
Correct answer is D
There are 5 unpaired electrons present in \(_{26}Fe^{3+}\).
The atomic number of iron is 26, so it has 26 electrons. When iron loses 3 electrons to form \(Fe^{3+}\), it loses 2 from the s orbital and 1 from the d orbital. This leaves 5 unpaired electrons in the d orbital.
The electron configuration of \(Fe^{3+}\) is [Ar]3d5. The 5 d electrons are all unpaired because Hund's rule states that electrons will occupy degenerate orbitals singly before they pair up. This is because unpaired electrons have a lower energy than paired electrons.
If X is a group lll element, its oxide would be represented as ...
Which of the following raw materials is used in the plastic industry? ...
Which of the following statements is true? ...
Steam changes the colour of anhydrous cobalt (II) chloride from ...
On heating, the following trioxocarbonate (IV) salts decompose to give solid residue except ...
Ammonia gas is suitable for performing the 'Fountain' experiment because the gas is ...