What does phosphine $(PH_3)$ form when it reacts with acids?

Which of the following is the incorrect order?

An orange solid $(X)$ on heating,gives a colourless gas $(Y)$ and a green residue $(Z).$ Gas $(Y)$ on treatment with $Mg,$ produces a white solid substance. Identify the white solid substance.

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.....

The decreasing values of bond angles from $NH_3$ $(106^o)$ to $SbH_3$ $(101^o)$ down group-$15$ of the periodic table is due to

How is ammonia manufactured industrially?