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JEE Main20199 Jan 2019Evening ShiftChemistryClassification of Elements and Periodicity in PropertiesActual

When the first electron gain enthalpy ( Δ H e g ) of oxygen is - 141 k J / m o l , its second electron gain enthalpy is:

Options

  1. AA positive value
  2. BAlmost the same as that of the first
  3. CNegative, but less negative than the first
  4. DA more negative value than the first

Correct answer

A. A positive value

Step-by-step solution

Second electron gain enthalpy is always positive for every element because to overcome repulsion between an anion and electron, energy has to be supplied. O − + e − → O − 2   ;     Δ H e g = + v e

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