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  4. Ionization And Electron Gain Enthalpy MCQ - Practice Questions with Answers

Ionization And Electron Gain Enthalpy MCQ - Practice Questions with Answers

Edited By admin | Updated on Sep 25, 2023 25:23 PM | #NEET

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What is the value of electron gain enthalpy Na+ if IE1 of Na = 5.1 eV?

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What is the value of electron gain enthalpy of Na+ if IE1 of Na = 5.1 eV?

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Concepts Covered - 1

Ionization And Electron Gain Enthalpy

Ionization Energy and Electron Affinity

Ionization energy and electron affinity are defined at absolute zero. At any other temperature, heat capacities for the reactants and the products have to be taken into account.

\begin{array}{l}{\mathrm{M}(\mathrm{g}) \rightarrow \mathrm{M}^{+}(\mathrm{g})+\mathrm{e}^{-} \text {(for ionization) }} \\ {\mathrm{M}(\mathrm{g})+\mathrm{e}^{-} \rightarrow \mathrm{M}^{-}(\mathrm{g}) \text { (for electron gain) }}\end{array}

at temperature, T is

\Delta_{r} H^{\ominus}(T)=\Delta_{r} H^{\ominus}(0)+\int_{0}^{T} \Delta_{r} C_{p}^{\ominus} d T

The value of Cp for each species in the above reaction is 5/2 R (CV = 3/2R)

\begin{aligned} \text { So, } \Delta_{r} C_{p}^{\ominus} &=+5 / 2 \mathrm{R} \text { (for ionization) } \\ \Delta_{I} C_{p}^{\ominus} &=-5 / 2 \mathrm{R} \text { (for electron gain) } \end{aligned}

Therefore,

\begin{array}{l}{\Delta_{r} H^{\ominus}(\text { ionization enthalpy })} {=E_{0}(\text { ionization energy })+5 / 2 \mathrm{RT}} \\ {\Delta_{r} H^{\ominus}(\text { electron gain enthalpy) }} {=-\mathrm{A}(\text { electron affinity) }-5 / 2 \mathrm{RT}}\end{array}

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Ionization And Electron Gain Enthalpy

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Ionization And Electron Gain Enthalpy Current Topic

Thermodynamics
Thermodynamic Property
State Functions
Reversible, Irreversible, Polytropic Process
Zeroth Law Of Thermodynamics
Introduction To Heat, Internal Energy And Work
First Law of Thermodynamics
Isothermal Expansion of an Ideal Gas
Adiabatic Process
Graphical Comparison of Thermodynamic Processes

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Ionization And Electron Gain Enthalpy

Chemistry Part I Textbook for Class XI

Page No. : 179

Line : 40

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