Question

what is rock salt ?answer it please

Answer 1

NaCl
Hope it helps.

Answer 2

This is the common name for the mineral "halite". Its chemical formula is NaCl. You might know this substance as table salt. and... Actually, rock salt is not K2SO4; it is NaCl. It can have impurities of gypsum (CaSO4) and sylvite (KCl) but it is very rare to find potassium sulfate as a mineral, although occasionally polyhalite (K2Ca2Mg(SO4)4.2H2O) is found associated with rock salt deposits.
formation -
It is typically formed by the evaporation of salty water (such as sea water) which contains dissolved Na+ and Cl- ions