Classification of Elements and Periodicity in Properties - Result Question 15
####15. Which one of the following arrangements represents the correct order of least negative to most negative electron gain enthalpy for $C, Ca$, $Al, F$ and $O$ ?
[NEET Kar. 2013]
(a) $Ca<Al<C<O<F$ $Al<Ca<O<C<F$
(c) $Al<O<C<Ca<F$
(d) C $<$ F $<O<Al<Ca$
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Solution:
- (a) As the nuclear charge increases, the force of attraction between the nucleus and the incoming electron increases and hence the elecron gain enthalpy becomes more negative, hence the correct order is
$Ca<Al<C<O<F$
