Questions

When the first electron gain enthalpy $(Δ_{e_{g}} H)$ of oxygen is-141 kJ/mol, its second electron gain enthalpy is

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a

a positive value

b

a more negative value than the first

c

almost the same as that of the first

d

negative. but less negative than the first

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detailed solution

Correct option is A

As given, the first electron gain enthalpy of oxygen can be shown as, O(g)+e−⟶O−(g),ΔegH1=−141kJ/mol The expression of second electron gain enthalpy of oxygen will be,O−(g)+e−⟶O2−(g),ΔegH2=+ ve ΔegH2 of oxygen is positive, i.e. endothermic, because a strong electrostatic repulsion will be observed between highly negative O and the incoming electron (e-).A very high amount of energy will be consumed (endothermic) by the system to overcome the electrostatic repulsion.

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Similar Questions

Assertion: More is the electron affinity greater is the reducing character

Reason: Reducing character depends on number of electrons gained.

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