In the electrothermal process,the compound displaced by silica from calcium phosphate is

Which of the following has the lowest boiling point?

The oxide which contains an odd electron at the nitrogen atom is ..... .

Which of the following allotropes of phosphorus is the most stable,has a graphite-like structure,and is a conductor of electricity?

In the nitrogen family,the $H-M-H$ bond angle in the hydrides $MH_3$ gradually becomes closer to $90^o$ on going from $N$ to $Sb$. This shows that gradually

Which of the following is a metalloid?