Short Answer TypeAssigns reasons for the following:
(i) Transition metals exhibit enthalpy of atomisation.
(ii) Transition metals form interstitial compounds.
Explain why:
(i) Transition elements are metals?
(ii) Lanthanides are uniformly trivalent?
Write the preparation of :
(i) Potassium dichromate from chromite.
(ii) KMnO4 from pyrolusite.
Long Answer TypeShort Answer TypeHow do you explain the paramagnetism and colour exhibited by compounds of transition metals?
Transition element exhibit colour due to d-d transition, d-d transition is possible only when d- subshell have unpaired electron. Thus transition metal compounds are shows coloure because of the presence of one or more unpaired electrons in the d-orbital of the metal ion. A compound of transition metal appears coloured when one frequency of definite energy is absorbed (E = hv) for d-d transition of the unpaired electron and other frequencies of visible region are transmitted. The colour of the compound corresponds to the frequency of the transmitted light. Thus, the observed colour (frequency) is complementary to the absorbed frequency.
Vanadium ion has a magnetic moment of 1.73 BM. What is the symbol of the ion? (Atomic number of V = 23)
Why are the compounds of transition elements usually coloured, both in the solid state and in aqueous solution?
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