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JEE Main 20199 JanuaryEvening Shift

Exam: JEE Main
Year: 2019
Date: 9 January
Shift: Evening Shift
Subject: Chemistry
Chapter: Classification of Elements and Periodicity in Properties

JEE Main 2019 · 9 January · Evening Shift · Chemistry · Classification of Elements and Periodicity in Properties

When the first electron gain enthalpy ( Δ H _ eg ) of oxygen is -...

When the first electron gain enthalpy

( \Delta{H}_{eg} )

of oxygen is

- 141kJ / mol

, its second electron gain enthalpy is:

Options

AA positive value
BAlmost the same as that of the first
CNegative, but less negative than the first
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.

${O}^{-} + {e}^{-} \to {O}^{- 2} ; \Delta{H}_{eg} = + ve$

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