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Given below are two statement : one is labelled as Assertion A and the other is labelled as Reason R

Assertion A : 5f electron can participate in bonding to a far greater extent than 4f electrons

Reason R : 5f orbitals are not as buried as 4f orbitals

In the light of the above statements, choose the correct answer from the options given below

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Important Questions on The d- and f-Block Elements

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Chemistry>Inorganic Chemistry>The d- and f-Block Elements>The Lanthanoids
The lanthanoid contraction is due to
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Chemistry>Inorganic Chemistry>The d- and f-Block Elements>The Lanthanoids
Gadolinium belongs of 4f series. Its atomic number is 64. Which of the following is the correct electronic configuration of gadolinium?
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Chemistry>Inorganic Chemistry>The d- and f-Block Elements>The Lanthanoids
Which of the following elements has the largest atomic radius?
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Chemistry>Inorganic Chemistry>The d- and f-Block Elements>The Lanthanoids
Because of lanthanoid contraction, which of the following pairs of elements have nearly the same atomic radii? (Number in the parenthesis are atomic numbers).
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Chemistry>Inorganic Chemistry>The d- and f-Block Elements>The Lanthanoids
The elements in which electrons are progressively filled in 4f orbital are called
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Chemistry>Inorganic Chemistry>The d- and f-Block Elements>The Lanthanoids
Which of the following pairs has the same size?
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Chemistry>Inorganic Chemistry>The d- and f-Block Elements>The Lanthanoids
Identify the incorrect statement from the following:
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Chemistry>Inorganic Chemistry>The d- and f-Block Elements>The Lanthanoids
What are the different oxidation states exhibited by lanthanoids?
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Chemistry>Inorganic Chemistry>The d- and f-Block Elements>The Lanthanoids
Incorrect statement with reference to Ce Z=58
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Chemistry>Inorganic Chemistry>The d- and f-Block Elements>The Lanthanoids
Why europium (II) is more stable than Cerium (II)?
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Chemistry>Inorganic Chemistry>The d- and f-Block Elements>The Lanthanoids

Given below are two statements :

Statement I : The E° value of Ce4+/Ce3+ is +1.74 V

Statement II : Ce is more stable in Ce4+ state than Ce3+ state.

In the light of the above statements, choose the most appropriate answer from the options given below:

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Chemistry>Inorganic Chemistry>The d- and f-Block Elements>The Lanthanoids
The pair that has similar atomic radii is:
MEDIUM
Chemistry>Inorganic Chemistry>The d- and f-Block Elements>The Lanthanoids
Name the members of the lanthanoid series which exhibit +4 oxidation state and those which exhibit +2 oxidation states. Try to correlate this type of behaviour with the electronic configuration of these elements.
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Chemistry>Inorganic Chemistry>The d- and f-Block Elements>The Lanthanoids
Decrease in ionic size in a period is observed in
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Chemistry>Inorganic Chemistry>The d- and f-Block Elements>The Lanthanoids
Write down the electronic configuration of Pm3+.
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Chemistry>Inorganic Chemistry>The d- and f-Block Elements>The Lanthanoids
The Eu2+ ion is a strong reducing agent in spite of its ground state electronic configuration (outermost) : [Atomic number of Eu=63 ]
MEDIUM
Chemistry>Inorganic Chemistry>The d- and f-Block Elements>The Lanthanoids
Among the lanthanide Eu, Tb, Er and Dy, which one readily forms stable divalent ions?
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Chemistry>Inorganic Chemistry>The d- and f-Block Elements>The Lanthanoids
The correct electronic configuration and spin-only magnetic moment (BM) of Gd3+(Z=64), respectively, are :
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Chemistry>Inorganic Chemistry>The d- and f-Block Elements>The Lanthanoids
Reason of lanthanoid contraction is:
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Chemistry>Inorganic Chemistry>The d- and f-Block Elements>The Lanthanoids
The effect of lanthanoid contraction in the lanthanoid series of elements by and large means