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JEE MainChemistryClassification of Elements and Periodicity in Properties

Given below are two statements: Statement I: The first ionization enthalpy of Nitrogen is greater than that of Oxygen. Statement II: The second ionization enthalpy of Nitrogen is greater than that of Oxygen. In the light of the above statements, choose the most appropriate answer from the options given below.

Options

  1. ABoth Statement I and Statement II are true
  2. BStatement I is true but Statement II is false
  3. CStatement I is false but Statement II is true
  4. DBoth Statement I and Statement II are false

Correct answer

B. Statement I is true but Statement II is false

Step-by-step solution

The electronic configuration of neutral Nitrogen (N) is 1s^2 2s^2 2p^3 and that of Oxygen (O) is 1s^2 2s^2 2p^4 . Nitrogen has an exactly half-filled 2p subshell, which provides extra stability. Therefore, it requires more energy to remove the first electron from Nitrogen than from Oxygen. Thus, Statement I is true. The second ionization enthalpy involves removing an electron from the unipositive cations. The electronic configuration of N ^+ is 1s^2 2s^2 2p^2 . The electronic configuration of O ^+ is 1s^2 2s^2 2p^3

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