A mixture of MgO and Mg weighing 10g is treated with excess of dil HCl. Then 2.24 lit of H2 gas was liberated under STP conditions.The mass of MgO present in the sample is

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A mixture of MgO and Mg weighing 10g is treated with excess of dil HCl. Then 2.24 lit of H₂ gas was liberated under STP conditions.The mass of MgO present in the sample is

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2.4g

7.6g

answer is B.

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Detailed Solution

$\begin{array}{l} Mg + 2 HCl \to {MgCl}_{2} + H_{2} \\ \Rightarrow 24 gm Mg - 22 .4 {ltrsH}_{2} \\ Wt of Mgo = 10 - Wt of Mg = 10 - 2 .4 = 7 .6 \end{array}$