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  4. 12 g of Mg (at. mass 24 ) on reacting completely with acid gives hydrogen gas, the volume of which at STP would be

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Q. $12 \,g$ of $Mg$ (at. mass $24$ ) on reacting completely with acid gives hydrogen gas, the volume of which at $STP$ would be

Some Basic Concepts of Chemistry

Solution:

$Mg +2\, HCl \rightarrow MgCl _{2}+ H _{2}$

$24 \,g\, Mg$ evolves $22.4\, L \,H _{2}$ at STP

$\therefore 12\, g\, Mg$ evolves $H _{2}$ at STP $\frac{22.4}{24} \times 12=11.2 \,L$ at STP.