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CHEMISTRY-CBSE-12-2018-->View question

Account for the following : (CHEMISTRY-CBSE-12-2018)

Account for the following : (CHEMISTRY-CBSE-12-2018)
The highest oxidation state of a metal is exhibited in its oxides or fluorides only.
Transition metals form coloured compounds.
Transition elements form interstitial compounds.

Asked On2019-04-10 13:15:49 by:naikaumprakash

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1. Both fluorine and oxygen have small size, high electronegativity and also high negative electron gain enthalpy. They can oxidise a metal to the highest oxidation state. Thus, the highest oxidation states are shown in the oxides and fluorides of transition metals.   

2.Transition elements have 3d orbitals with the same energy level however when molecules/ligands form dative covalent bonds with a metal ion, the electron repulsion causes the 3d orbitals to split into lower and higher energy levels.

The energy required to cause an electron to jump from a lower 3d orbital to higher 3d orbital corresponds to a certain wavelength of visible light. This wavelength is absorbed while the other wavelengths of light pass through which gives the compound its colour. The complement of the colour absorbed is seen.

3.Transition metals from interstitial compounds. This is because of the availability of enough space inside the crystal lattice of metals of accommodate small atoms like H,C or N.

Such compounds have higher melting point than those of pure metals .

Answerd on:2019-06-20 Answerd By:Gaganpreet-Gandhi


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