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Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.
Assertion (A): Cerium (Ce) exhibits +4 oxidation state.
Reason (R): Ce4+ has 4f4 electronic configuration which is less stable.
  • a)
    Both A and R are true and R is the correct explanation of A.
  • b)
    Both A and R are true but R is NOT the correct explanation of A.
  • c)
    A is true but R is false.
  • d)
    A is false and R is True.
Correct answer is option 'C'. Can you explain this answer?
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Directions: In the following questions, A statement of Assertion (A) ...
Cerium exhibits +4 oxidation state because Ce4+ has 4f0 electronic configuration which is most stable.
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Directions: In the following questions, A statement of Assertion (A) ...
Assertion (A): Cerium (Ce) exhibits 4 oxidation state.
Reason (R): Ce4+ has 4f4 electronic configuration which is less stable.

Explanation:

Assertion (A): Cerium (Ce) exhibits 4 oxidation state.
Explanation:
- Cerium is a chemical element with atomic number 58 and symbol Ce. It belongs to the lanthanide series of elements.
- In its ground state, cerium has an electronic configuration of [Xe] 4f1 5d1 6s2. The 4f orbital can accommodate a maximum of 14 electrons, but in the ground state of cerium, only one electron occupies the 4f orbital.
- Cerium can lose four electrons to achieve a stable octet configuration in its +4 oxidation state. This results in the formation of Ce4+ ions, which have a 4f0 electronic configuration.
- Therefore, cerium exhibits a 4+ oxidation state.

Reason (R): Ce4+ has 4f4 electronic configuration which is less stable.
Explanation:
- The reason provided is incorrect. Ce4+ ions do not have a 4f4 electronic configuration. In fact, Ce4+ ions have a 4f0 electronic configuration.
- The 4f orbitals in cerium are relatively higher in energy compared to the 5d and 6s orbitals. As a result, the 4f orbitals are shielded from the outer environment and do not participate in chemical bonding.
- When cerium loses four electrons to form Ce4+ ions, the 4f orbital remains empty. This empty 4f orbital contributes to the stability of the Ce4+ ion by reducing the repulsion between electrons.
- The empty 4f orbital also allows the Ce4+ ion to achieve a stable configuration similar to the noble gas xenon, which has a completely filled 4f orbital.
- Therefore, the stability of the Ce4+ ion is not due to its 4f4 electronic configuration, but rather due to the empty 4f orbital and the achievement of a stable electron configuration.

Conclusion:
- The assertion (A) is true, as cerium exhibits a 4+ oxidation state.
- However, the reason (R) is false, as Ce4+ ions have a 4f0 electronic configuration, not a 4f4 electronic configuration.
- Therefore, the correct answer is option 'c' - A is true, but R is false.
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Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.Assertion (A): Cerium (Ce) exhibits +4 oxidation state.Reason (R): Ce4+ has 4f4 electronic configuration which is less stable.a)Both A and R are true and R is the correct explanation of A.b)Both A and R are true but R is NOT the correct explanation of A.c)A is true but R is false.d)A is false and R is True.Correct answer is option 'C'. Can you explain this answer?
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Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.Assertion (A): Cerium (Ce) exhibits +4 oxidation state.Reason (R): Ce4+ has 4f4 electronic configuration which is less stable.a)Both A and R are true and R is the correct explanation of A.b)Both A and R are true but R is NOT the correct explanation of A.c)A is true but R is false.d)A is false and R is True.Correct answer is option 'C'. Can you explain this answer? for Class 12 2024 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.Assertion (A): Cerium (Ce) exhibits +4 oxidation state.Reason (R): Ce4+ has 4f4 electronic configuration which is less stable.a)Both A and R are true and R is the correct explanation of A.b)Both A and R are true but R is NOT the correct explanation of A.c)A is true but R is false.d)A is false and R is True.Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for Class 12 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.Assertion (A): Cerium (Ce) exhibits +4 oxidation state.Reason (R): Ce4+ has 4f4 electronic configuration which is less stable.a)Both A and R are true and R is the correct explanation of A.b)Both A and R are true but R is NOT the correct explanation of A.c)A is true but R is false.d)A is false and R is True.Correct answer is option 'C'. Can you explain this answer?.
Solutions for Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.Assertion (A): Cerium (Ce) exhibits +4 oxidation state.Reason (R): Ce4+ has 4f4 electronic configuration which is less stable.a)Both A and R are true and R is the correct explanation of A.b)Both A and R are true but R is NOT the correct explanation of A.c)A is true but R is false.d)A is false and R is True.Correct answer is option 'C'. Can you explain this answer? in English & in Hindi are available as part of our courses for Class 12. Download more important topics, notes, lectures and mock test series for Class 12 Exam by signing up for free.
Here you can find the meaning of Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.Assertion (A): Cerium (Ce) exhibits +4 oxidation state.Reason (R): Ce4+ has 4f4 electronic configuration which is less stable.a)Both A and R are true and R is the correct explanation of A.b)Both A and R are true but R is NOT the correct explanation of A.c)A is true but R is false.d)A is false and R is True.Correct answer is option 'C'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.Assertion (A): Cerium (Ce) exhibits +4 oxidation state.Reason (R): Ce4+ has 4f4 electronic configuration which is less stable.a)Both A and R are true and R is the correct explanation of A.b)Both A and R are true but R is NOT the correct explanation of A.c)A is true but R is false.d)A is false and R is True.Correct answer is option 'C'. Can you explain this answer?, a detailed solution for Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.Assertion (A): Cerium (Ce) exhibits +4 oxidation state.Reason (R): Ce4+ has 4f4 electronic configuration which is less stable.a)Both A and R are true and R is the correct explanation of A.b)Both A and R are true but R is NOT the correct explanation of A.c)A is true but R is false.d)A is false and R is True.Correct answer is option 'C'. Can you explain this answer? has been provided alongside types of Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.Assertion (A): Cerium (Ce) exhibits +4 oxidation state.Reason (R): Ce4+ has 4f4 electronic configuration which is less stable.a)Both A and R are true and R is the correct explanation of A.b)Both A and R are true but R is NOT the correct explanation of A.c)A is true but R is false.d)A is false and R is True.Correct answer is option 'C'. Can you explain this answer? theory, EduRev gives you an ample number of questions to practice Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.Assertion (A): Cerium (Ce) exhibits +4 oxidation state.Reason (R): Ce4+ has 4f4 electronic configuration which is less stable.a)Both A and R are true and R is the correct explanation of A.b)Both A and R are true but R is NOT the correct explanation of A.c)A is true but R is false.d)A is false and R is True.Correct answer is option 'C'. Can you explain this answer? tests, examples and also practice Class 12 tests.
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