Magnesium form Mg²⁺ and Mg⁺ because :
(a) ionic radius of Mg(II) is smaller than of Mg(I).
(b) hydration energy of divalent magnesium ion is higher.
(c) magnesium (II) carbonate is insoluble in water.
(d) generally higher oxidation states are preferred by metals.
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the right answer is C
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