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On the basis of Lanthanoid contraction, explain the following: Trends in the stability of oxo salts of lanthanoids from La to Lu.

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प्रश्न

On the basis of Lanthanoid contraction, explain the following:

Trends in the stability of oxo salts of lanthanoids from \[\ce{La}\] to \[\ce{Lu}\].

दीर्घउत्तर
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उत्तर

The stability of Oxo salts is directly proportional to the size of atom, as we move from \[\ce{La}\] to \[\ce{Lu}\], the size of the atom decreases and hence the stability of oxo salts also decreases.

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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.(ii) | पृष्ठ ११५

संबंधित प्रश्न

What are chemical twins? Write ‘two’ examples.


Compare the chemistry of actinoids with that of lanthanoids with special reference to electronic configuration.


Name the members of the lanthanoid series which exhibit +4 oxidation state and those which exhibit +2 oxidation state. Try to correlate this type of behavior with the electronic configurations of these elements.


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


Explain, why lanthanum (Z = 57) forms La3+ ion, while cerium (Z = 58) forms Ce4+ ion?


Account for the following: 

Zn, Cd and Hg are soft metals.


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


What is lanthanoid contraction?


The f-block elements are known as ____________.


Although Zr belongs to 4d and Hf belongs to 5d transition series but it is quite difficult to separate them. Why?


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


Match the compounds/elements given in Column I with uses given in Column II.

  Column I (Compound/element) Column II (Use)
(i)  Lanthanoid oxide (a) Production of iron alloy
(ii)  Lanthanoid (b) Television screen
(iii)  Misch metal (c) Petroleum cracking
(iv)  Magnesium based alloy is constituent of (d) Lanthanoid metal + iron
(v)  Mixed oxides of lanthanoids are employed (e) Bullets
    (f) In X-ray screen

Match the property given in Column I with the element given in Column II.

  Column I (Property) Column II (Element)
(i) Lanthanoid which shows
+4 oxidation state
(a) Pm
(ii) Lanthanoid which can show +2
oxidation state
(b) Ce
(iii) Radioactive lanthanoid (c) Lu
(iv) Lanthanoid which has 4f7
electronic configuration in +3
oxidation state
(d) Eu
(v) Lanthanoid which has 4f14
electronic configuration in
+3 oxidation state
(e) Gd
    (f) Dy

On the basis of Lanthanoid contraction, explain the following:

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


The titanium (Z = 22) compound that does not exist is:-


In lanthanoid the last electron enters (n - 2)f subshell where n is equal to ______.


Mischmetal is an alloy consisting mainly of ______.


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


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