A strip of magnesium is burnt in air and the product obtained is allowed to react with sulphuric acid. Which of the following ions are present in the final salt obtained?

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Solution

When magnesium strip is burned in air, magnesium oxide is obtained.

$2\text{Mg}~+~\text{O}_2\rightarrow ~2\text{MgO}$

Being a metallic oxide, it is basic in nature, and with sulphuric acid it undergoes neutralization reaction. As a result, magnesium sulphate salt and water are formed as products.

$\text{MgO} + \text{H}_2\text{SO}_4 \rightarrow \text{MgSO}_4 + \text{H}_2\text{O}$

Magnesium sulphate, $\text{MgSO}_4$, has $\text{Mg}^{2+}$ and $\text{SO}_4^{2-}$ as cation and anion respectively.

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