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Given below are two statement : one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : 5f electron can participate in bonding to a far greater extent than 4f electrons. Reason R : 5f orbitals are not as buried as 4f orbitals. In the light of the above statements, choose the correct answer from the options given below (1) A is false but R is true (2) Both A and R are true and R is the correct explanation of A (3) A is true but R is false (4) Both A and R are true but R is NOT the correct explanation of A

1. A is false but R is true
2. Both A and R are true and R is the correct explanation of A
3. A is true but R is false
4. Both A and R are true but R is NOT the correct explanation of A

Correct answer: Both A and R are true and R is the correct explanation of A

Solution

The assertion is correct because 5f electrons can indeed participate more in bonding due to their less shielded nature compared to 4f electrons, which are more buried in the electron cloud. The reason accurately explains this phenomenon, as the 5f orbitals being less buried allows for greater interaction with other atoms.

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