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NEETChemistryStructure of Atom

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): The maximum number of electrons in a d-subshell is 10 , and its permissible m_l values range from -2 to +2 . Reason (R): For a given value of azimuthal quantum number l , there are (2l + 1) possible values of magnetic quantum number m_l , and according to Pauli's exclusion principle, each orbital c

Options

  1. ABoth Assertion (A) and Reason (R) are true but Reason (R) is NOT the correct explanation of Assertion (A)
  2. BAssertion (A) is true but Reason (R) is false
  3. CAssertion (A) is false but Reason (R) is true
  4. DBoth Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A)

Correct answer

D. Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A)

Step-by-step solution

Evaluate Assertion (A): For a d-subshell, the azimuthal quantum number l = 2 . The permissible values of the magnetic quantum number m_l range from -l to +l , which are -2, -1, 0, +1, +2 . This gives a total of 5 orbitals. Since each orbital can hold a maximum of 2 electrons, the maximum number of electrons in the d-subshell is 5 2 = 10 . Thus, Assertion (A) is true. Evaluate Reason (R): The formula (2l + 1) correctly gives the total number of orbitals in a subshell for a given l . Pauli's exclusion principle state

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