JEE Main Chemistry question

The set representing the correct order of first ionisation energy is [DCE 2005]

(A)
(B)Correct
(C)
(D)

Answer: (B)

Solution

Ionisation energy decreases down a group as atomic size increases; within Group 2, kJ/mol, matching option (B). Option (A) reverses the correct Group-1

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Question ID VK-133154