Classification of Elements and Periodicity in Properties - Result Question 19

####19. Which of the following represents the correct order of increasing electron gain enthalpy with negative sign for the elements O,S,F and Cl ?

[2005, 2010]

(a) Cl< F < O <S

(b) O < S < F <Cl

(c) F < S < O <Cl

(d) S < O <Cl<F

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Solution:

  1. (b) O<S<F<Cl

Electron gain enthalpy of given elements are 141,200,333 and 349kJmol1 respectively.

Due to small size of atom, addition of an electron is not easy. This is the reason why the magnitude of electron gain enthalpy of oxygen and fluorine is less than that of sulphur and chlorine respectively.



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