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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)
As we have learned
Ionisation enthalpy decreases down the group. So, correct order is : Li > Na > K > Rb
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