Question

Hydrogen can be prepared by the action of dil $H_{2}S{O}_4$ on

• A. copper
• B. iron
• C. lead
• D. mercury

Answer 1

Answer: (B)

Hydrogen cannot be prepared by the action of dil. $H_{2}S{O}_4$ on copper or mercury as these two metals cannot displace hydrogen from acids. Action of dil. $H_{2}S{O}_4$ on $Pb$ stops after some time due to the formation of insoluble $PbS{O}_4$. Only iron reacts rapidly with dil. $H_{2}S{O}_4$ to give $H_2$.