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STD 11 - 2. structure of atom — JEE STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceJEESTD 11 - 2. structure of atom4 Marks
MCQ
Given below are two statement: one is labelled as Assertion $A$ and the other is labelled as Reason $R$

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

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

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

  • A
    Both $A$ and $R$ are true but $R$ is NOT the correct explanation of $A$
  • ✓
    Both $A$ and $R$ are true and $R$ is the correct explanation of $A$
  • C
    $A$ is false but $R$ is true
  • D
    $A$ is true but $R$ is false
✓

Answer

Correct option: B.
Both $A$ and $R$ are true and $R$ is the correct explanation of $A$
b
$5 f$ orbital not buried as $4 f$ orbitals so $e ^{-}$ present in $5 f$ orbital experience less nuclear attraction than $e ^{-}$present in $4 f$ orbital. Hence electrons of 5 f orbital can take part in bonding to a far greater extent.

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