Explain the following observation :
Most of the transition metal ions exhibit characteristic colour in aqueous solution.
Most of the transition metal ions exhibit characteristic colour in aqueous solution.
Most of complexes of transition elements are coloured due to d-d transition. This is because of the absorption of radiation from visible light region to promote an electron from one of the d-orbitals to another. The ions of transition elements absorb the radiation of a particular wavelength and the rest is reflected, imparting colour to the solution.
Assign the reason for the following :
Copper (I) ion is not known in aqueous solution.
What are the transition elements ? Write two characteristics of the transition elements.
What is meant by ‘disproportionation’ ? Give an example of a disproportionation reaction in aqueous solution.
How would you account for the following ? Many of the transition elements are known to form interstitial compounds.
Write the formula of an oxo-anion of Manganese (Mn) in which it shows the oxidation state equal to its group number.
Write the formula of an oxo-anion of Chromium (Cr) in which it shows the oxidation state equal to its group number.
When Cu²⁺ ion is treated with KI, a white precipitate is formed. Explain the reaction with the help of chemical equation.
When Cu²⁺ ion is treated with KI, a white precipitate is formed. Explain the reaction with the help of chemical equation.
Write the formula of an oxo-anion of Chromium (Cr) in which it shows the oxidation state equal to its group number.
Explain the following :
(i) The enthalpies of atomization of transition metals are quite high.
(ii) The transition metals and many of their compounds act as good catalysts.
Explain the following observation :
Most of the transition metal ions exhibit characteristic colour in aqueous solution.