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Refractive indices of binary and ternary mixtures of 1-hydroxyethyl-3-methylimidazolium chlor ide([HOEMIm]Cl),1-hydroxyethyl-2,3-methylimidazolium chloride([HOEMMIm]Cl),hydroxyeth-ylmethylammomium chloride([OHEN1,1,1]Cl)with methanol and water were experimentally measured at 293.15 K and atmospheric pressure.