Which of the following compounds gives $N_2$ on heating?

Which of the following is the correct decreasing order of bond angles in the hydrides of group $15$ elements?

Which of the following is not known?

In which of the following compounds does hydrolysis take place through $S_N^1$ and $S_N^2$ mechanisms respectively?

Which of the following properties of white phosphorus are shared by red phosphorus?

An inorganic salt $(A)$ is decomposed at about $523 \ K$ to give products $(B)$ and $(C).$ Compound $(C)$ is a liquid at room temperature and is neutral to litmus paper,while oxide $(B)$ on burning with white phosphorus,gives a dehydrating agent $(D).$ Compounds $(A)$,$(B)$,$(C)$ and $(D)$ will be identified as: