Which blue liquid is obtained on reacting equimolar amounts of two gases at $-30\,^oC$?

The oxoacid of phosphorus having the strongest reducing property is

What is the product formed when ammonia reacts with excess chlorine?

Give the preparation of phosphorus trichloride and phosphorus pentachloride.

Statement $(A)$: Among the oxides of nitrogen, $NO$ and $NO_2$ are paramagnetic.
Statement $(B)$: $NO$ is paramagnetic in the gaseous state and diamagnetic in the liquid state.
The correct answer is:

What is produced when white phosphorus is boiled with a strong solution of caustic soda?