A mixture of MgO and Mg weighing 10 g is...

A mixture of MgO and Mg weighing 10 g is treated with excess of dil `HCl`. Then 2.24 lit of `H_(2)` gas was liberated under STP conditions . The mass of MgO present in the sample is

2.4 g

7.6 g

8 g

2 g

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