Electron Gain Enthalpy and its Applications

IMPORTANT

Electron Gain Enthalpy and its Applications: Overview

This topic covers concepts, such as, Electron Gain Enthalpy, Factors Affecting Electron Gain Enthalpy, Variation of Electron Gain Enthalpy in Periodic Table, Applications of Electron Gain Enthalpy & Exceptions in Trends of Electron Gain Enthalpy etc.

Important Questions on Electron Gain Enthalpy and its Applications

MEDIUM
IMPORTANT

The electron affinity of bromine is 3.36 eV. How much energy in kcal is released when 8 g of bromine is completely converted to Br- ions in the gaseous state? (1 eV=23.06 kcal mol-1). (Give the value rounded-off to the nearest integer)

MEDIUM
IMPORTANT

The second-period element, for example, F has less electron gain enthalpy than the third-period element of the same group for example Cl. Why?

HARD
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The calculated electron gain enthalpy values for alkaline earth metals and noble gases are positive. How can you explain this?

HARD
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How do Electron affinity change in a group and period?

EASY
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Which of the following has the lowest electron affinity?

HARD
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Consider the process:
Ag-e-A+g
If HIE for the process is 21.4eV/ atom. What will be the value of Heg electron gain enthalpy for A+g (in eV/atom)?

EASY
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Which of the following set of elements will have no affinity for electron?

MEDIUM
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The formation of the oxide ion, O2-g, from oxygen atom requires first an exothermic and then an endothermic step as shown below:

Og+e-O-g;  ΔH=-141 kJ mol-1

O-g+e-O2-g;  ΔH=+780 kJ mol-1

Thus process of formation of O2- in gas phase is unfavourable even though O2- is isoelectronic with Neon. It is due to the fact that,

EASY
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Which of them has highest value of negative electron gain enthalpy ?

EASY
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Which of the following processes will release minimum energy?

MEDIUM
IMPORTANT

Among halogens, the correct order of amount of energy released in electron gain (electron gain enthalpy) is :

MEDIUM
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The electronic configuration of four elements I, II, III and IV are given:

: 1s2 2s2 2p5

II : 1s2 2s2 2p4

III : 1s2 2s2 2p6 3s2 3p5

IV : 1s2 2s2 2p6 3s2 3p3

Which element has highest value of 1st  Electron gain enthalpy (magnitude):

MEDIUM
IMPORTANT

In periodic table, the basic character of oxides:

EASY
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Which of the following option will release maximum energy on adding one electron?
(in there respective family) 
 

MEDIUM
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The electron affinity of the members of oxygen family of the periodic table, follows the sequence

MEDIUM
IMPORTANT

Which arrangement represents the correct order of electron gain enthalpy (with negative sign) of the given atomic species?