What are the products formed when $MgO$ reacts with $HCl$ ?

{MgCl}_{2} (aq) + H_{2} (g)

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{MgCl}_{2} (aq) + H_{2} O (l)

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{MgCl}_{2} (aq) + H_{2} (g) + O_{2} (g)

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{Mg(OH)}_{2} (aq) + H_{2} O (l) + {Cl}_{2} (g)

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Solution

The correct option is B ${MgCl}_{2} (aq) + H_{2} O (l)$
When a metal oxide reacts with an acid, salt and water are formed. Magnesium oxide $(MgO)$ reacts with hydrochloric acid $(HCl)$ to give magnesium chloride ${(MgCl}_{2})$ and water.
The reaction takes place as follows:

$MgO (s) + 2 HCl (aq) \to {MgCl}_{2} (aq) + H_{2} O (l)$

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