Chemistry-Transition Elements
NEET Chemistry Transition Elements Assertion Reason Question
Type: Assertion Reason-assertion-Hard-Class 12
Assertion (A): The lanthanoid contraction results in the second and third d series having similar radii and properties. | Reason (R): The imperfect shielding of 4f electrons by each other causes a decrease in size across the series.
A
Both A and R are true and R is the correct explanation of A.
B
Both A and R are true but R is not the correct explanation of A.
C
A is true but R is false.
D
A is false.
Correct Answer
Option A
Detailed Explanation
The lanthanoid contraction leads to similar radii in the second and third d series due to the imperfect shielding of 4f electrons, as stated in Chunk 1.
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