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Q.

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

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a

A is incorrect but R is correct.

b

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

c

A is correct but R is incorrect

d

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

answer is A.

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Detailed Solution

Assertion is not true but reason is true.
Actinoids form relatively morestable complexes a compared to lanthanoids because of actinoids can utilize their 5f orbitals along with 6d orbitals in bonding but lanthanoids do not use their 4f orbitals for bonding.

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