Isotopic exchange behaviour of nickel xanthate is studied in presence of three isomeric toluidines at 25°C. The results show that the complex becomes labile in the kinetic sense in presence ofm- andp-toluidines. The complex displays inert behaviour in the presence ofo-toluidine and it is ascribed to dominant steric effect.

New isentropic compressibility data are reported for four ternary mixtures, which contained methylethylketone andn-octane as common components. 1-propanol, 1-butanol, 1-pentanol and 1-hexanol, which form a homologous series, were used as non-common components. The deviation in isentropic compressibility has been computed from the experimental results and compressibility of ideal mixtures. The deviation is positive over the whole range of volume fraction in the fourt mixtures. The positive deviation suggests that the structure breaking effect of the components outweighs the structure making effect.