The rate constant for the reaction,$2 \ N_2O_{5(g)} \longrightarrow 2 \ N_2O_{4(g)} + O_{2(g)}$ is $4.98 \times 10^{-4} \ s^{-1}$. What is the order of reaction?

$\frac{d}{{dy}}\left( {{{\sin }^{ - 1}}\left( {\frac{{3y}}{2} - \frac{{{y^3}}}{2}} \right)} \right) =$

Each statement in the key is called

$A$ metal salt gives a yellow precipitate with potassium chromate in acetic acid and a white precipitate with dilute sulfuric acid. However,it does not give a precipitate with sodium chloride or iodide. What will be the composition of the white precipitate formed when sodium carbonate is added to the solution of the metal salt?

Which of the following plant groups produces seeds but is non-flowering?

Define environmental chemistry.