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  • In which of the following pairs, electron gain enthalpies of constituent elements are nearly the same or identical ? (A) <img alt="\mathrm{ \mathrm{Rb} \: and\: Cs}" src="/latex-image/?%5Cma

In which of the following pairs, electron gain enthalpies of constituent elements are nearly the same or identical ?
(A) \mathrm{ \mathrm{Rb} \: and\: Cs}
(B) \mathrm{\mathrm{Na} \: and\: \mathrm{K}}
(C) \mathrm{Ar \: and\: \mathrm{Kr}}
(D) \mathrm{ I \: and \: At}
Choose the correct answer from the options given below :
 

Option: 1

(A) and (B) only
 


Option: 2

(B) and (C) only
 


Option: 3

(A) and (C) only
 


Option: 4

(C) and (D) only


Answers (1)

best_answer

From the given option -

(Rb and Cs) have nearly same electron gain enthalpy which is nearly \mathrm{-46\, KJ/mol}.

Whereas (Ar and Kr) have nearly same electron gain  enthalpy of \mathrm{+96\, KJ/mol} .

Hence option (C) is correct.

Posted by

jitender.kumar

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