The oxide which forms a dimer is

The boiling points of the following hydrides follow the order of:

Why does the reactivity of nitrogen differ from phosphorus?

When calomel reacts with $NH_4OH$ solution,the compound formed is

How many bridging oxygen atoms are present in $P_4O_{10}$?

In the hydrides of the nitrogen group,the $H-M-H$ bond angle gradually approaches $90^o$ as we move from $N$ to $Sb$. This indicates that gradually.....