Which one of the following fertilisers is least hygroscopic?

Solution (By Examveda Team)

Diammonium phosphate (DAP) is the world's most widely used Phosphorus fertilizer which is the least hygroscopic among all the given options, which means it is less likely to absorb moisture from the air, whereas urea, Ammonium sulphate and CAN are more likely to absorb moisture from the air when left open.