Q.

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

2.4g

b

7.6g

c

2g

d

8g

answer is B.

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Detailed Solution

Mg+2HClMgCl2+H224gm Mg22.4ltrsH2 Wt of Mgo=10Wt of Mg=102.4=7.6

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