Question

Granulated Zn is used in the laboratory preparation of hydrogen because it contains , which acts as a during the reaction.

• A. Cu
• B. Mg
• C. reactant
• D. catalyst

Answer 1

Answer: (A), (D)

The correct options are
A Cu
D catalyst

When granulated Zn is made to react with an acid, it produces hydrogen gas. Copper (Cu) is present as an impurity in granulated Zn. Cu present in it acts a catalyst and speeds up the reaction. For example,

$\mathrm{Zn}\left(s\right)+2\mathrm{HCl}\left(\mathrm{aq}\right)\to {\mathrm{ZnCl}}_2\left(\mathrm{aq}\right)+H_2\left(g\right)$