A $25.0\,\text{cm}^3$ portion of $0.150\,\text{mol dm}^{-3}$ $\text{NH}_4\text{NO}_2(aq)$ is heated. Calculate the greatest volume, in $\text{dm}^3$, of nitrogen produced at room temperature and pressure.
The concentration of $\text{NH}_4\text{NO}_2(aq)$ is reduced. The reaction temperature stays constant. State and explain how the rate of reaction is affected.
$\text{NH}_4\text{NO}_2$ contains the ammonium ion, $\text{NH}_4^+$, and the nitrite ion. A mixture of aqueous calcium hydroxide and $\text{NH}_4\text{NO}_2(s)$ is warmed. Calcium nitrite, water and a gas are produced. The gas turns damp red litmus paper blue. Write the equation for this reaction.
$\text{NH}_4\text{NO}_2(aq)$ is added to a sample of aqueous potassium iodide. A brown solution forms. Name the brown solution.
Name the type of reaction responsible for the formation of this brown solution.