What test reagent used in this experiment will distinguish a soluble cl- salt from so42- salt? what is the distinguishing observation?

The two ions to be distinguished are : Chloride ion and sulphate ion

The chloride ion can be identified by addition of silver nitrate to the solution containing chloride ion

On addition of silver nitrate, chloride ion will react with silver ions to form a white precipitate of silver chloride

The reaction is

Ag+ (a)  + Cl-(aq)  ---> AgCl(s)

the solution containing sulphate ion can be identified by adding barium chloride

Ba+2  + SO4^-2   > BaSO4(s), white ppt

thus barium chloride reacts with sulphate ion to form white ppt

a rain shadow is a dry region of land on the side that is protected against the prevailing winds of a mountain range. the prevailing winds are the winds that occur most of the time in a particular place of the earth

prevailing winds carry air toward the mountain range. as the air rises up over a mountain range, the air cools, water vapor condenses, and clouds form. on this side of the mountains, called the windward side, precipitation falls in the form of  rain  or snow. this dry air produces a  rain shadow.

space exploration has led to the development and technological improvement of many everyday items. (if this answer is wrong i will find the right answer) : )