MHT CET 2026 Chemistry question

Chemistry Classification of Elements and Periodicity in Properties MHT CET 2026

Identify the elements of alkali metals and alkaline earth metals respectively having highest 1st ionization enthalpy.

(A)K and Ca
(B)Li and BeCorrect
(C)Rb and Ba
(D)K and Sr

Answer: (B)

Solution

In a group, atomic size increases down the group and the outer electron is held less tightly, so first ionisation enthalpy decreases down the group. Therefore the highest value in group 1 belongs to

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Question ID VK-097559