i) Chromatography involves distribution of solute between: (a) two stationary phases (b) two mobile phases (c) a stationary phase and mobile phase (d) none of these ii) Rate of filtration through conical funnel can be increased by using: (a) fine filter paper (b) ordinary filter paper (c) flutted filter paper (d) cellulose filter paper iii) In which of following techniques, separating funnel is used: (a) sublimation (b) solvent extraction (c) crystallization (d) chromatography iv) Basic principle of crystallization is that solute should be soluble in solvent at: (a) freezing temperature (b) room temperature (c) high temperature (d) none of these v) Safe and reliable method of drying crystals is through: (a) pressing (b) using oven (c) vacuum desicator (d) evaporation of solution vi) To achieve good separation of two liquids, they are shaken to increase the area of: (a) miscibility (b) separation (c) contact (d) solubility vii) 27 gm of Al reacts completely with how much mass of O2 to produce Al2O3: (a) 8 gm of oxygen (b) 16 gm of oxygen (c) 32 gm of oxygen (d) 24 gm of oxygen
Posted on: Sat, 08 Jun 2013 19:00:26 +0000