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

MHT CET Chemistry question

Magnesium form 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 of Mg (I)
(D)Hydration energy of divalent magnesium ion is higherCorrect

Answer: (D)

Solution

The large hydration (and lattice) energy released by the small, doubly charged more than compensates for the second ionisation enthalpy, so is unstable

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Question ID VK-067147