A) Li > Na > K
B) K > Li > Na
C) Na > Li > K
D) Li > K > Na
Correct Answer: A
Solution :
In a group, the ionisation potential decreases from top to bottom. In the alkali group, the ionisation potential decreases from Li to Cs. Li Na K Rb Cs eV 5.3 5.1 4.3 4.2 3.9
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