JEE Main Chemistry question

The ionisation potential order for which set is correct? [Manipal 2010]

(A)Cs < Li < K
(B)Cs < Li > B
(C)Li > K > CsCorrect
(D)B > Li < K

Answer: (C)

Solution

Ionisation energy decreases on descending a group because atomic size increases and the outer electron is held less tightly. Within Group 1, Li > Na > K > Rb > Cs, so Li > K > Cs is

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Question ID VK-133101