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Chemistry
Which of the following processes involves absorption of energy?
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Q. Which of the following processes involves absorption of energy?
Classification of Elements and Periodicity in Properties
A
$Cl ( g )+ e ^{-} \longrightarrow Cl ^{-}( g )$
7%
B
$O ^{-}( g )+ e ^{-} \longrightarrow O ^{2-}( g )$
71%
C
$O ( g )+ e ^{-} \longrightarrow O ^{-}( g )$
5%
D
$S ( g )+ e ^{-} \longrightarrow S ^{-}( g )$
17%
Solution:
Second electron gain enthalpy is always positive because after first $e ^{-}$ion will have negative charge shows repulsion towards new electron.