Heating $P_4O_{10}$ with water yields ..............

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?

Illustrate how copper metal can give different products on reaction with $HNO_3$.

Which of the following statements is not correct regarding the $NO_2$ molecule?

Which of the phosphorus oxoacids can create a silver mirror from $AgNO_3$ solution?

Phosphorus has three allotropic forms:
$(i)$ white phosphorus
$(ii)$ red phosphorus and
$(iii)$ black phosphorus.
Write the difference between white and red phosphorus on the basis of their structure and reactivity.