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D and F Block Elements question

2023 · 12 Apr · Shift 1 · Q6
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  5. /2023 · 12 Apr · Shift 1 · Q6

D and F Block Elements question

2023 · 12 Apr · Shift 1 · Q6

JEE MainChemistryD and F Block ElementsMCQ+4 / −1
Given below are two statement: one is labelled as Assertion A\mathbf{A}A and the other is labelled as Reason R\mathbf{R}R Assertion A: 5f5 \mathrm{f}5f electrons can participate in bonding to a far greater extent than 4f4 \mathrm{f}4f electrons Reason R: 5f5 \mathrm{f}5f orbitals are not as buried as 4f4 \mathrm{f}4f orbitals In the light of the above statements, choose the correct answer from the options given below
  1. A
    Both A and R are true and R is the correct explanation of A
  2. B
    Both A and R are true but R is NOT the correct explanation of A
  3. C
    A is true but R is false
  4. D
    A is false but R is true
View written solutionFree

Correct answer: A

  1. Analyze Assertion A

    Assertion: 5f5f5f electrons can participate in bonding to a far greater extent than 4f4f4f electrons.

    This is true.

    • In actinoids, the 5f5f5f orbitals are more extended in space.
    • Hence, they can overlap better with ligand orbitals.
    • Therefore, 5f5f5f electrons are more available for bonding.

  2. Analyze Reason R

    Reason: 5f5f5f orbitals are not as buried as 4f4f4f orbitals.

    This is also true.

    • In lanthanoids, 4f4f4f orbitals are deeply buried inside the atom beneath the outer orbitals.
    • Because of this, 4f4f4f electrons do not participate much in bonding.
    • In contrast, 5f5f5f orbitals in actinoids are less buried and more exposed.

  3. Check whether R explains A

    Since 5f5f5f orbitals are less buried than 4f4f4f orbitals, they can overlap more effectively with orbitals of other atoms.

    Thus, the reason directly explains why 5f5f5f electrons participate in bonding more than 4f4f4f electrons.

  4. Conclusion

    • Assertion A: True
    • Reason R: True
    • R correctly explains A

    Therefore, the correct option is:

    A\boxed{\text{A}}A​

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