Question Pool The d- and f- Block Elements

The d- and f- Block Elements - SAMAGRA Question Pool & Answers | Class 12

Kerala Syllabus SAMAGRA SCERT SAMAGRA Question Pool for Class 12 Chemistry The d- and f- Block Elements

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Qn 1.

The general electronic configuration of transition elements is ……………

(a) (n-2)d1-10 ns 1-2                   (b) nd1-10ns1-2

(c)  (n-1) d1-10 ns1-2                  (d) (n-1)d1-10 ns0

 



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Qn 2.

Account for the following.

a) The transition metals generally form coloured compounds.

b) Transition metals act as good catalyst.

c) Transition metals form alloys.



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Qn 3.

a) Transition metals and most of their compounds show paramagnetic behaviour. Why?

b) Find the magnetic moment in Bohr Magneton (BM) of Co2+ ion

(Hint: Outer electronic configuration of Co is 3s2 3p6 3d7 4s2)


 



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Qn 4.

Give reasons for the following.

  (a)  Transition elements have variable oxidation state

  (b) The aqueous solution of Cu+ is not stable



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Qn 5.

The atomic and ionic radii of third transition series of elements show regular decrease with increasing atomic number.

(a) Name this phenomenon

(b) Explain the reason for this phenomenon and write any two consequences of it.



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Qn 6.

The outer electronic configuration of Au is 5s25p65d106s1  and  that of Zn is 3s2 3p63d104s2  

                (a)  Write the outer electronic  configuration of Au2+ and Zn2+ ions

                (b) Explain why Au is considered as a transition element but Zn is not



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