s-Block ElementsHard

Question

What is [X] in the following reaction ?
MgCl2 + H2O [X] + HCl + H2O 

Options

A.MgO
B.Mg
C.Mg(OH)2
D.Mg(OH)Cl.

Solution

MgCl2 + 2 H2O MgO + 2 HCl + H2O.

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