Published by:
CGP EDU Academic Team
Published on: August 14, 2026
Given below are two statement: one is labelled as Assertion A and the other is labelled as Reason 
:
Assertion 
: Size of 
ion is less than 
ion.
Reason 
The above is a consequence of the lanthanoidcontraction.
choose the correct answer from the options given below:
A
is false but 
is true
B
Both 
and 
are true but 
is not the correct explanation of 
and are true but is not the correct explanation of
C
Both 
and 
are true and 
is the correct explanation of 
and are true and is the correct explanation of
D
is true but 
is false
Text Solution
Verified by ExpertsThe correct answer is:
D
Size of 
ion is less than that of 
due to actinoid contraction. As we know that in a period fromleft to right ionic radius decreases and in actinide series it is due to actinoid contraction.
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