JEE Main 202116 MarchMorning Shift
- Exam
- JEE Main
- Year
- 2021
- Date
- 16 March
- Shift
- Morning Shift
- Subject
- Chemistry
- Chapter
- d and f Block Elements
JEE Main 2021 · 16 March · Morning Shift · Chemistry · d and f Block Elements
Given below are two statement : one is labelled as Assertion A and...
Given below are two statement : one is labelled as Assertion A and the other is labelled as Reason R :
Assertion A : Size of ion is less than ion.
Reason R : The above is a consequence of the lanthanide contraction.
In the light of the above statements, choose the correct answer from the options given below :
Options
- AA is false but R is true
- BBoth A and R are true but R is not the correct explanation of A
- CA is true but R is false
- D
Both A and R are true and R is the correct explanation of A
Correct answer
C. A is true but R is false
Step-by-step solution
Size of ion is less than that of due to actinide contraction.
As we know that in a period from left to right ionic radius decreases and in actinide series it is due to actinide contraction.