The number of $P-O-P$ bonds in cyclic metaphosphoric acid is

How is ammonia manufactured industrially?

In pyrophosphorous acid,the number of $P-OH$,$P-H$,and $P=O$ linkages are respectively:

Explain the chemical behaviour of oxoacids of phosphorus.

Which among the following is non-poisonous in nature?

Given below are two statements:
Statement $I$: The halogen that makes the longest bond with hydrogen in $HX$ has the smallest covalent radius in its group.
Statement $II$: $A$ group $15$ element's hydride $EH_3$ has the lowest boiling point among corresponding hydrides of other group $15$ elements. The maximum covalency of that element $E$ is $4$.
In the light of the above statements,choose the correct answer from the options given below.