JEE Main · 2022 · 27 Jul 2022 · Shift 2 · Classification of Elements and Periodicity

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An element A of group 1 shows similarity to an element B belonging to group 2. If A has maximum hydration enthalpy in group 1 then B is:

(A)Mg✓ Correct
(B)Be
(C)Ca
(D)Sr

Answer: (A)

Solution

Element A from group 1 with maximum hydration enthalpy is lithium (Li), due to its smallest ionic size in the group. Lithium shows a diagonal relationship with magnesium (Mg) from group 2. This diagonal relationship arises because Li⁺ and Mg²⁺ have similar charge-to-size ratios, leading to similar chemical properties.

Therefore, B is Mg.

JEE Main · 2022 · 27 Jul 2022 · Shift 2 · Single correct option

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