Explain giving reasons:
(1) Transition metals and many of their compounds
show paramagnetic behaviour.
(ii) The enthalpies of atomisation of the transition
metals are high.
(iii) The transition metals generally form coloured
compounds.
(iv) Transition metals and their many compounds act
as good catalyst.
Answers
Answer:
(i) Transition metals and many of their compounds show paramagnetic behaviour.
(ii) The enthalpies of atomisation of the transition metals are high.
(iii) The transition metals generally form coloured compounds.
(iv) Transition metals and their many compounds act as good catalyst.
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Answer:
(1)Transition metals show paramagnetic behaviour. Paramagnetism arises due to the presence of unpaired electrons with each electron having a magnetic moment associated with its spin angular momentum and orbital angular momentum. ... Therefore, the resulting paramagnetism is only because of the unpaired electron.
(2) Transition elements have high effective nuclear charge and a large number of valence electrons. Therefore, they form very strong metallic bonds which results in high enthalpies of atomisation.
(3) When visible light falls on a transition metal compound or ion, the unpaired electrons present in the lower energe d-orbital get promoted to high energy d-orbitals, called d-d transition, due to the absorption of visible light. ... Therefore, transmitted light shows some colour complementary to the absorbed colour.
(4) Transition metals and their many compounds act as good catalyst. ... The ability of transition metals to be in a variety of oxidation states, the ability to interchange between the oxidation states and the ability to form complexes with the reagents and be a good source for electrons make transition metals good catalysts.