Question

In the laboratory preparation of dihydrogen, which of the following species is reduced?

• A. $Z{n}^{+}$
• B. $H^{+}$
• C. Both a and b
• D. None of the above

Answer 1

The correct option is B $H^{+}$

The chemical reaction for laboratory preparation of water is shown below:
$Zn+H_{2}S{O}_4\to ZnS{O}_4+H_2$, or
$Zn+2HCl\to ZnC{l}_2+H_2$

This shows that in either case,$H^{+}$ is being reduced to $H_2$.

THEORY
Laboratory method: By the action of granulated zinc with dilute HCl.
$Zn+dil.HCl⟶ZnC{l}_2+H_2$
Laboratory method: By the action of zinc with aqueous alkali.
$Zn+2NaOH\stackrel{\Delta }{⟶}N{a}_{2}Zn{O}_2+H_2$