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The correct order of decreasing ionisation enthalpy in 1st group element is : 

Option: 1

K < Li < Na <  Rb 


Option: 2

Rb > Na > K > Li 


Option: 3

Na > Li > K > Rb 


Option: 4

Li > Na > K > Rb 


Answers (1)

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As we have learned  

Ionisation enthalpy decreases down the group. So, correct order is : Li > Na > K > Rb 

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vinayak

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