The moisture present in ammonia can be removed by using which of the following?

$N_2$ combines with metals to form:

When $NH_3$ reacts with $Cl_2$,which of the following statements are correct?
$(a)$ $NCl_3$ is formed when $Cl_2$ is in excess.
$(b)$ $N_2$ is formed when $Cl_2$ is in excess.
$(c)$ $N_2$ is formed when $NH_3$ is in excess.
$(d)$ $NCl_3$ is formed when $NH_3$ is in excess.

Assertion: $NO$ and $NO_2$ both are paramagnetic gases.
Reason: $NO$ gas is responsible for the Brown ring test.

Which of the following phosphorus oxyacids can act as a reducing agent?

With reference to protonic acids,which of the following statements is correct?