Van't Hoff factor of 75% dissociated NaCl solution is

n=2 forMono basic acids….HCl, HNO3, HCOOH, CH3COOH  etc;Mono acidic bases….MOH (M= monovalent cation), NH4OH  etc;Monovalent metal halides…..MX(NaX, KX etc) ;Bivalent metal sulphates and carbonates…..MSO4(MgSO4, CaSO4 etc), MCO3(MgCO3, CaCO3 etc) ;They all are classified as ‘AB’ type electrolytes…..AB ⇌An++Bn- ; n=2                     Van't Hoff factor, i = 1-α+nα ;when n= 2 …Van't Hoff factor, i = 1+α ; α= Degree of ionization  (or) dissociation ;Ex ; For 5% ionized ‘AB’  α=5100= 0.05 ;0.1, 0.15, 0.2, 0.25, 0.3…..for 10%, 15%, 20%, 25%, 30% ionized ‘AB’α for x% ‘AB’ = x100;