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.
(i) The enthalpies of atomization of transition metals are quite high.
(ii) The transition metals and many of their compounds act as good catalysts.
(i) The transition elements exhibit high enthalpies of atomization because they have large number of unpaired electrons in their atoms. Due to which they have stronger interatomic interaction and hence stronger bonding between atoms.
(ii) Transition elements and their compounds shows good catalytic properties because :
(a) They have variable valencies, show multiple oxidation states, forms unstable intermediate compounds and provides a new path with lower activation energy for the reaction.
(b) In some cases, transition elements provide a suitable surface for the reaction to take place.
(ii) Transition elements and their compounds shows good catalytic properties because :
(a) They have variable valencies, show multiple oxidation states, forms unstable intermediate compounds and provides a new path with lower activation energy for the reaction.
(b) In some cases, transition elements provide a suitable surface for the reaction to take place.
Explain the following observation :
Most of the transition metal ions exhibit characteristic colour in aqueous solution.
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.
What are the transition elements ? Write two characteristics of the transition elements.
Describe the oxidising action of potassium dichromate and write the ionic equations for its reaction with (i) an iodide (ii) H₂S.
How would you account for the following ? Many of the transition elements are known to form interstitial compounds.
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 boiling point elevation constant for a solvent or ebullioscopic constant.