4
2
3
5
Correct answer is D
There are 5 unpaired electrons present in 26Fe3+.
The atomic number of iron is 26, so it has 26 electrons. When iron loses 3 electrons to form Fe3+, 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 Fe3+ 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.
The alloy used for welding and plumbing contains ...
Hypochlorous acid is used as a bleach because ...
Which of the following CANNOT be obtained by fractional distillation of petroleum? ...
Which of the following are the products of the reaction between CH3COOH and CI2 in sunlight?...
The bleaching action of chlorine is through the process? ...
Which of the following statements about chlorine and iodine at room temperature is correct? ...
The products of the reaction between dilute sulphuric acid and sodium thiosulphate crystals are? ...