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Given below are two statements : Statement I : The first ionization enthalpy of Cr is lower than that of Mn . Statement II : The second and third ionization enthalpies of Cr are higher than those of Mn. In the light of the above statements, choose the correct answer from the options given below :

Options

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

Correct answer

D. Statement I is true but Statement II is false

Step-by-step solution

Statement I: The electronic configuration of Cr is [Ar] 3d^5 4s^1 and Mn is [Ar] 3d^5 4s^2 . For Cr , the first electron is removed from 4s^1 , while for Mn , it is removed from a stable fully filled 4s^2 subshell. Additionally, Mn has a higher nuclear charge. Thus, the first ionization enthalpy ( IE₁ ) of Cr ( 653 kJ/mol ) is lower than that of Mn ( 717 kJ/mol ). Statement I is true. Statement II: For the second ionization enthalpy ( IE₂ ), Cr^+ has configuration [Ar] 3d^5 (stable half-filled) and Mn^+ has [Ar] 3d

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