Long Answer Type(a) Comment on the following tendencies of transition elements of first series:
(i) They exhibit variable oxidation states.
(ii) They easily form alloys.
(iii) They often act as catalyst.
(b) State the different characteristic of actinoids and lanthanoids which places them in f-block elements.
(c) How many unpaired electrons are there in Ni2+(aq)?
Account for the following:
(a) Transition elements have high boiling point and high enthalpy of atomisation.
(b) Zn, Cd, Hg are normally not regarded as transition elements.
(c) Transition metals generally form alloys with other transition metals.
(d) Transition metals form a number of interstitial compounds.
(e) Ni2+ compounds are thermodynamically more stable than Pt2+ compounds.
(i) What are inner transition elements? Write their general electronic configuration.
(ii) The chemistry of the actinoid elements is not so smooth as that of the Lanthanoids. Justify this statement by giving some examples from the oxidation state of these elements?
Describe the general characteristics of the transition elements with special reference to their tendency to
(i) exhibit paramagnetism, (ii) form complex compounds, (iii) their catalytic behaviour.
Short Answer TypeWhat are the transition elements? Write two characteristics of the transition elements ?
Elements that possess incompletely filled d-orbitals either in their ground state or in any of their oxidation states are known as transition elements. The name transition element given to the elements of d-block is only because of their position between s-block and p-block elements.
Characteristics of transition elements are as follows:
1. They show paramagnetic behaviour.
2. They show variable oxidation states.
3. They exhibit catalytic properties.
4. They generally form complex compounds.
5. They generally form coloured compounds.
How would you account for the following?
Actinoid contraction is greater than lanthanoid contraction.
Which metal in the first transition series (3d series) exhibits + 1 oxidation state most frequently and why?
Which of the following cations are coloured in aqueous solutions and why?
Sc3+, V3+, Ti4+, Mn2+ (Atomic number Sc = 21, V = 23, Ti = 22, Mn = 25)
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