Question

Fill in the blanks using the appropriate words given below:

(Sulphur dioxide, Nitrogen dioxide, Nitric oxide, Sulphuric acid)

Cold, dilute nitric acid reacts with copper to give___

Answer 1

1. Dilute nitric acid $\left({\mathrm{HNO}}_3\right)$reacts with almost all metals except some noble metals like platinum $\left(\mathrm{Pt}\right)$, Gold $\left(\mathrm{Au}\right)$
2. It forms different products depending upon the nature of the metal, the concentration of nitric acid,$\left({\mathrm{HNO}}_3\right)$and temperature.
3. So, cold, dilute nitric acid reacts with copper to give Nitric oxide.

$$\begin{gathered} 3\mathrm{Cu}\left(\mathrm{s}\right)+8{\mathrm{HNO}}_3\left(\mathrm{l}\right)\to 3\mathrm{Cu}\left({\mathrm{NO}}_3\right)\left(\mathrm{l}\right)+4{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)+2\mathrm{NO}\left(\mathrm{g}\right) \\ \left(\mathrm{Copper}\right)(\mathrm{Nitric}(\mathrm{Nitric} \\ \mathrm{acid})\mathrm{oxide}) \end{gathered}$$