In the Birkeland-Eyde process,the raw material used is:

Three allotropes $(A)$,$(B)$ and $(C)$ of phosphorus in the following change are respectively
$A \xrightarrow[1200 \ atm]{470 \ K} B$
$A \xrightarrow[CO_2 - atm]{570 \ K} C$

$NH_3$ is $NOT$ used in which of the following?

Which of the following is a liquid obtained from an equimolar mixture of two gases at $-30\,^oC$?

When dilute $H_2SO_4$ is added to dry $KNO_3$,brown fumes are evolved. What are these brown fumes?

On reaction with $Cl_2$,phosphorus forms two types of halides $A$ and $B$. Halide $A$ is a yellowish-white powder,while halide $B$ is a colourless oily liquid. Identify $A$ and $B$ and write the formulas of their hydrolysis products.