Which of the following statements are correct
I. Both LiCl and MgCl2 are soluble in ethanol
II. Both LiCl and MgCl2 are deliquescent
III. LiCl and MgCl2 form hydrates like LiCl.8H2O and MgCl2.2H2O
IV. NaHCO3 used as fire extinguisher