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Q.

Which of the following 3d-metal ion will give the lowest enthalpy of hydration $(Δ_{hyd} H)$ when dissolved in water ?

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a

${Fe}^{2 +}$

b

${Mn}^{2 +}$

c

${Co}^{2 +}$

d

${Cr}^{2 +}$

answer is B.

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Detailed Solution

detailed_solution_thumbnail

Hydration enthalpy order ${Co}^{2 +} > {Fe}^{2 +} > {Cr}^{2 +} > {Mn}^{2 +}$
Therefore, Mn⁺²has lowest hydration enthalpy

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