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The D-And-f-Block Elements

Question
CBSEENCH12007296
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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.

Solution

i) Paramagnetism is due to presence of one or more unpaired electrons which are attracted by the magnetic. The electronic configuration of transition element is (n-1)d1–10ns1–2. Thus in transition element number of unpaired electron exist.  Paramagnetic materials include magnesium, molybdenum, lithium, and tantalum 
also always transition metals have unpaired d-electron.

ii) The transition metals form a large number of complex compounds. This is due to the comparatively smaller sizes of the metal ions, their high ionic charges and the availability of d orbitals for bond formation. A few examples are: [Fe(CN)6]3–, [Fe(CN)6]4–,[Cu(NH3)4]2+ and [PtCl4]2–.

iii) The most important reason transition metals are good catalysts is that they can lend electrons or withdraw electrons from the reagent, depending on the nature of the reaction. 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.

Some More Questions From The d-And-f-Block Elements Chapter

Explain why Cu+ ion is not stable in aqueous solutions?

Actinoid contraction is greater from element to element than lanthanoid contraction. Why?

On what ground can you say that scandium (Z = 21) is a transition element but zinc (Z = 30) is not?

The outer electronic configuration of copper is 3d10 4s1, yet it is considered transition element. Why?

Why the melting points of transition elements are high?

Why Zn, Cd and Hg are not regarded as transition elements?

Name the first element of 3rd transition series.

Though copper, silver and gold have completely filled sets of d-orbitals yet they are considered as transition metals. Why?

Why are transition elements so named?

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