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quantum chemistry colligative properties colligative property carbohydtrates carbohydrate absolute viscosity relative viscosity coefficient of viscosity measurement of viscosity units of viscosity viscometry ostawald viscometer viscosity why liquid drops are spherical units of surface tension drop number method measurment of surface tension stalagmometer surface tension mot molecular orbital theory electronic spectroscopy uv-visible spectroscopy sulphur syste water system phase rule phase equilibria polymers macromolecules natural drugs synthetic drugs synthetic dyes physical quantum chemistry reverse osmosis osmosis elevation in boiling point depression in freezing point