SATHEE: Classification of Elements and Periodicity in Properties

Classification of Elements and Periodicity in Properties - Result Question 17

####17. What is the value of electron gain enthalpy of $N a^{+}$ if $I E_{1}$ of $N a = 5.1 e V$ ?

(a) $- 5.1 e V$

(b) $- 10.2 e V$

(c) $+ 2.55 e V$

(d) $+ 10.2 e V$

[2011M]

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Solution:

(a) $I E_{1}$ of $N a = -$ Electron gain enthalpy of $N a^{+}$ $= - 5.1 e V$ .

In this question, temperature is to be defined as absolute zero. This is due to the fact that ionization energy and electron affinity are defined at absolute zero temperature.

Ionization enthalpy $=$ ionization energy $+ \frac{5}{2} R T$

Electron gain enthalpy=electron affinity $- \frac{5}{2} R T$

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Classification of Elements and Periodicity in Properties - Result Question 17

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