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?
i) As with all metals, the transition elements are both ductile and malleable, and conduct electricity and heat. The interesting thing about transition metals is that their valence electrons, or the electrons they use to combine with other elements, are present in more than one shell.
Thus transition element are metals.
ii) The principal oxidation state of lanthanoids is (+3). However, sometimes we also encounter oxidation states of + 2 and + 4. This is because of extra stability of fully-filled and half-filled orbitals. Actinoids exhibit a greater range of oxidation states. This is because the 5f, 6d, and 7s levels are of comparable energies. Again, (+3) is the principal oxidation state for actinoids. Actinoids such as lanthanoids have more compounds in +3 state than in +4 state.
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?
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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