Question

Select the correct word / formula from the choices given below.

${\mathrm{I}}_2,{{\mathrm{Cu}(\mathrm{NO}}_3)}_2,{{\mathrm{NH}}_4\mathrm{NO}}_3,{\mathrm{NaNO}}_3,{\mathrm{FeSO}}_4,{\mathrm{KNO}}_3,{{\mathrm{Pb}(\mathrm{NO}}_3)}_2,\mathrm{NOCl},\mathrm{Zn}{\left({\mathrm{NO}}_3\right)}_2,{\mathrm{AgNO}}_3,\mathrm{Mg},\mathrm{Cu}$

Filter paper soaked in Potassium iodide when brought in contact with Nitric acid turns brown due to liberation of

Answer 1

1. Potassium iodide reacts with Nitric acid to form Potassium nitrate, Nitrogen dioxide, Iodine and Water.
2. The reaction is given below.
   $$\begin{gathered} 2\mathrm{KI}\left(\mathrm{aq}\right)+{4\mathrm{HNO}}_3\left(\mathrm{aq}\right)\to {2\mathrm{KNO}}_3\left(\mathrm{aq}\right)+2{\mathrm{NO}}_2\left(\mathrm{g}\right)+{\mathrm{I}}_2\left(\mathrm{g}\right)+2{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right) \\ \mathbf{Potassium}\mathbf{}\mathbf{Nitric}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{Potassium}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{Nitrogen}\mathbf{}\mathbf{}\mathbf{}\mathbf{Iodine}\mathbf{} \\ \mathbf{iodide}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{acid}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{Nitrate}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{}\mathbf{dioxide} \end{gathered}$$
3. Filter paper soaked in Potassium iodide when brought in contact with Nitric acid, the paper turns brown due to the liberation of Iodine.