Q30 / 90 · JEE Main 2019 (09 Jan Shift 2) · Chemistry

When the first electron gain enthalpy $(Δ H_{e g})$ of oxygen is $- 141 k J / m o l$ , its second electron gain enthalpy is:

Correct answer
A
A positive value
B
Almost the same as that of the first
C
Negative, but less negative than the first
D
A more negative value than the first

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.

$O^{-} + e^{-} \to O^{- 2}; Δ H_{e g} = + v e$

Hence, the correct answer is option: 'A'.

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When the first electron gain enthalpy ( Δ H eg ) of oxygen is -141 kJ/mol , its second electron gain enthalpy is:

Solution

Relevant Questions

When the first electron gain enthalpy $(Δ H_{e g})$ of oxygen is $- 141 k J / m o l$ , its second electron gain enthalpy is: