In the following reaction sequence, the compound $C$ is $Al + N_2$ $\xrightarrow{\Delta} (A)$ $\xrightarrow{H_2O} B (ppt) + C_{(g)}$

In Haber's process,hydrogen is obtained by reacting methane with steam in the presence of $NiO$ as a catalyst. This process is known as steam reforming. Why is it necessary to remove $CO$ when ammonia is obtained by Haber's process?

Which oxide does not act as a reducing agent?

Which of the following reactions give phosphine $(PH_3)$?
$(i)$ Reaction of calcium phosphide with water
$(ii)$ Heating white phosphorus with concentrated $NaOH$ solution in an inert atmosphere
$(iii)$ Heating red phosphorus with alkali

Which among the following oxides of nitrogen is called nitrogen sesquioxide?

Pure concentrated $HNO_3$ makes iron passive as the surface is covered with a protective layer of: