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JEE Main20204 Sep 2020Evening ShiftChemistryClassification of Elements and Periodicity in PropertiesActual

The process that is NOT endothermic in nature is :

Options

  1. AAr ( g ) + e - → Ar g -
  2. BH ( g ) + e - → H g -
  3. CO ( g ) - + e - → O ( g ) 2 -
  4. DNa ( g ) → Na g + + e -

Correct answer

B. H ( g ) + e - → H g -

Step-by-step solution

H (g) +e -   → extremic H - (g) ΔH eg = - 72 KJ / mol O - ( g ) + e - ⟶   → endeterm c   O 2 - ( g ) ΔH eg = + 744   KJ / mol Ar ( g ) + e -   → endeterm  c   Ar - ( g ) ΔH eg = + 96   KJ / mol Na ( g ) ⟶  endotherm  c   Na + ( g ) + e -  IE  = 495 . 8 KJ / mol

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