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Question

Which of the following represents the correct order of increasing first ionization enthalpy for Ca, Ba, S, Se and Ar? 



A

S< Se < Ca < Ba < Ar

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B

Ba < Ca < Se < S < Ar

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C

Ca < Ba < S < Se < Ar

 
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D

Ca < S < Ba < Se < Ar

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Solution

The correct option is C

Ba < Ca < Se < S < Ar


Ionisation energy increases along a period from left to right and decreases down a group. The position of given elements in the periodic table is as
Group No. 21618CaSArBaSe
Thus, the order of increasing ΔHIE1 is
Ba < Ca < Se < S < Ar


Chemistry

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