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  4. Hydrogen can be prepared by the action of dil H2SO4 on

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Q. Hydrogen can be prepared by the action of dil $H_{2}SO_{4}$ on

AIIMSAIIMS 2007

Solution:

Hydrogen cannot be prepared by the action of dil. $H _{2} SO _{4}$ on copper or mercury as these two metals cannot displace hydrogen from acids. Action of dil. $H _{2} SO _{4}$ on $Pb$ stops after some time due to the formation of insoluble $PbSO _{4}$. Only iron reacts rapidly with dil. $H _{2} SO _{4}$ to give $H _{2}$.