Magnesium forms Mg^ 2+ and not Mg^+ because:

JEE Main Chemistry question

Magnesium forms and not because:

(A)Magnesium(II) carbonate is insoluble in water
(B)Generally higher oxidation states are preferred by metals
(C)Ionic radius of Mg(II) is smaller than that of Mg(I)
(D)Hydration energy of the divalent magnesium ion is higherCorrect

Answer: (D)

Solution

Although removing the second electron from Mg costs additional ionization energy, the much larger hydration energy released on forming the smaller, doubly charged ion (compared to a hypothetical ) more than compensates for this, making the thermodynamically favoured species. The insolubility

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Question ID VK-138028