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Q.

Assertion (A): Actinoids form relatively less stable complexes as compared to lanthanoids.
Reason(R): Actinoids can utilize their 5f orbitals along with 6d orbitals in bonding but lanthanoids do not use their 4f orbital for bonding. 

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a

Both A and R are not correct

b

Both A and R are correct and R is the correct explanation of A

c

A is not correct but R is correct

d

Both A and R are correct but R is not the correct explanation of A

answer is D.

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A is false but R is true

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