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Explain giving reason: (i) Treansitio...

Explain giving reason:
(i) Treansition metals and their compounds generally exhibit a paramagnetic behave .
(ii) The chemistry of actinoids is not so smooth as that of lanthanoids.

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(i) Transition elements have relatively low ionization energies and have one or two electrons in their outermost energy level `(ns^(1) or ns^(2))`. As a result, metallic bonds are formed . Hence, they behave as metals.
(ii) There is a gerater range of oxidation states, which is in part attributed to the fact that the 5f,6d and 7s levels are of comparable energies.
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The chemistry of actinoids is not so smooth as that of lanthanoids. Give reason.

Explain gives reason. (a) Transition metal and many of their compounds show paramagnetic behavior. (b) The enthalpies of atomisation of the transition metal are high . (c) The transition metals generally from coloured compounds.

Explain giving a suitable reason for each of the following : (i) Transition metals and their compounds are generally found to be good catalysts. (ii) Metal-metals bonding is more frequent for the 4d and the 5d series of transitions metals than that for the 3d series.

Assign reasons for the following : (i) The enthalpies of atomisation of transition elements are high. (ii) The transition metals and many of their compounds act as good catalyst. (iii) From element to element the actinoid contraction is greater than the lanthanoid contraction. (iv) The E^(@) value for the Mn^(3+)//Mn^(2+) couple is much more positive than that for Cr^(3+)//Cr^(2+) . (v) Scandium (Z = 21) does not exhibit variable oxidation states and yet it is regarded as transition element.

Assign reasons for the following : (i) Transition metals and many fo their compounds act as good catalyst. (ii) Transition metals generally from coloured compounds.

Explain why: (i) Transition elements form coloured compounds. (ii) Cu^(+) is diamagnetic but Cu^(2+) is paramagnetic (Z=29)

Assign reasons for the following : (i) Cu(I) ion is not known to exist in aqueous solutions. (ii) Transition metals are much harder than the alkali metals. (iii) From element to element, actinoid contraction is greater than the lanthanoid contraction.

Give reason: (i) Transition metals show variable oxidation states. (ii) Actinoids show wide range of oxidation states.

Give reasons for each of the following: (i) Size of trivalent lanthanoid cation decreases with increase in the atomic number. (ii) Transition metal fluorides are ionic in nature whereas bromides and chlorides are usualy covalent in nature. (iii) Chemistry of all the lanthanoids is quite similar.

Assign reasons for each of the following : (i) Transiti9n metals generally form coloured compounds. (ii) Manganese exhibits the highest oxidation state of+ 7 among the 3d series of transition elements.

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