Write the formula of an oxo-anion of Chromium (Cr) in which it shows the oxidation state equal to its group number.
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.
Explain the following observation :
Most of the transition metal ions exhibit characteristic colour in aqueous solution.
What is meant by ‘disproportionation’ ? Give an example of a disproportionation reaction in aqueous solution.
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.
Write the structure of an isomer of compound C₄H₉Br which is most reactive towards reaction.
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.
What type of intermolecular attractive interaction exists in the pair of methanol and acetone ?