Directions \( \quad \) In the following questions a statement of As...

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Directions \( \quad \) In the following
questions a statement of Assertion (A) followed by a
statement of Reason (R) is given. Choose the correct
answer out of the following choices.
(a) Both A and R are correct; \( \mathrm{R} \) is the correct explanation of A.
(b) Both A and R are correct; \( \mathrm{R} \) is not the correct explanation of A.
(c) A is correct; \( \mathrm{R} \) is incorrect.
(d) \( \mathrm{R} \) is correct; \( \mathrm{A} \) is incorrect.
Assertion (A) Actinoids form relatively less stable complexes as compared to lanthanoids.
Reason (R) Actinoids can utilise their \( 5 f \)-orbitals alongwith \( 6 d \)-orbitals in bonding but lanthanoids do not use their \( 4 f \)-orbital for bonding.
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