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On the basis of Lanthanoid contraction, explain the following: Stability of the complexes of lanthanoids.

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प्रश्न

On the basis of Lanthanoid contraction, explain the following:

Stability of the complexes of lanthanoids.

दीर्घउत्तर
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उत्तर

As we move along the lanthanide series, the atomic size decreases. As a result, the charge/size ratio increases and the stability of the complexes also increases.

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अध्याय 8: The d-and f-Block Elements - Multiple Choice Questions (Type - I) [पृष्ठ ११५]

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एनसीईआरटी एक्झांप्लर Chemistry Exemplar [English] Class 12
अध्याय 8 The d-and f-Block Elements
Multiple Choice Questions (Type - I) | Q 67.(iii) | पृष्ठ ११५

संबंधित प्रश्न

What are chemical twins? Write ‘two’ examples.


Which among the following pairs of elements is 'not' an example of chemical twins?


Compare the chemistry of actinoids with that of the lanthanoids with special reference to oxidation state.


Compare the chemistry of actinoids with that of the lanthanoids with special reference to atomic and ionic sizes.


Write the electronic configuration of the element with the atomic number 61.


Explain effects of lanthanoid contraction.


What is meant by Lanthanide contraction? Write the general electronic configuration of inner transition elements. 


What is the action of the following on lanthanoids?
a. water
b. Sulphur, heat
c. nitrogen, heat


Gadolinium belongs to 4f series. It’s atomic number is 64. Which of the following is the correct electronic configuration of gadolinium?


General electronic configuration of actinoids is `(n-2)f^(1-14)(n - 1)d^(0-2)ns^2`.Which of the following actinoids have one electron in 6d orbital?

(i) U (Atomic no. 92)

(ii) Np (Atomic no.93)

(iii) Pu (Atomic no. 94)

(iv) Am (Atomic no. 95)


Although +3 is the characteristic oxidation state for lanthanoids but cerium also shows +4 oxidation state because:

(i) it has variable ionisation enthalpy

(ii) it has a tendency to attain noble gas configuration

(iii) it has a tendency to attain f 0 configuration

(iv) it resembles Pb4+ 


Although +3 oxidation states is the characteristic oxidation state of lanthanoids but cerium shows +4 oxidation state also. Why?


On the basis of Lanthanoid contraction, explain the following:

Nature of bonding in \[\ce{La2O3}\] and \[\ce{Lu2O3}\] .


On the basis of Lanthanoid contraction, explain the following:

Trends in acidic character of lanthanoid oxides.


Which of the following pairs has the same ionic size?


The lathanide ion that would show colour is ______.


Write a note on lanthanoids.


Name an important alloy which contains some of the lanthanoid metals.


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