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  4. A solution of MgCl2 in water has pH

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Q. $A $ solution of $ MgCl_2 $ in water has $pH $

The s-Block Elements

Solution:

$ MgCl_2 $ hydrolyses to give strong acid $ HCl,$ hence $pH $ of solution is acidic i.e. $ < \, 7;$
$MgCl_2 + 2H_2O \rightarrow MgO + 2HCl + H_2O $