Phosphine is produced by adding water to

The oxoacid of phosphorus that is easily obtained from a reaction of alkali and white phosphorus and has two $P-H$ bonds,is

Which of the following orders regarding the stability of phosphorus allotropes is correct?

Given below are two statements :
Statement $I$: Upon heating a borax bead dipped in cupric sulphate in a luminous flame,the colour of the bead becomes green.
Statement $II$: The green colour observed is due to the formation of copper$(I)$ metaborate.
In the light of the above statements,choose the most appropriate answer from the options given below :

Which oxide of nitrogen is obtained on heating ammonium nitrate at $250 \, ^oC$?

Nitric acid forms an oxide of nitrogen on reaction with $P_{4}O_{10}$. Write the reaction involved. Also,write the resonating structures of the oxide of nitrogen formed.