Question

When zinc reacts with sodium hydroxide, the products formed are

• A. zinc hydroxide and sodium
• B. sodium zincate and water
• C. sodium zincate and hydrogen gas
• D. sodium zincate and oxygen.

Answer 1

The correct option is D

sodium zincate and oxygen.

The explanation for the correct option (C):

• The reaction between metal and a base results in salt formation and the evolution of Hydrogen gas (${\mathrm{H}}_2$). Zinc ($\mathrm{Zn}$) is a metal and Sodium hydroxide ($\mathrm{NaOH}$) is a base.
• When $\mathrm{Zn}$ metal is added to $\mathrm{NaOH}$, it results in the formation of Sodium zincate (${\mathrm{Na}}_2{\mathrm{ZnO}}_2$) salt along with Hydrogen gas. The reaction between Zinc and Sodium hydroxide is:

$\mathrm{Zn}\left(\mathrm{s}\right)+2\mathrm{NaOH}\left(\mathrm{aq}\right)\to {\mathrm{Na}}_2{\mathrm{ZnO}}_2\left(\mathrm{aq}\right)+{\mathrm{H}}_2\left(\mathrm{g}\right)$

Final Answer: Hence, option (C) is correct. When Zinc reacts with Sodium hydroxide, the products formed are Sodium zincate and Hydrogen gas.