Q. Refluxing of part of the distillate in a fractionating column is a 'recycling operation', aimed primarily at

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Q. Which of the following expressions defines the Baume gravity scale for liquids heavier than water ?

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Q. The net heat evolved or absorbed in a chemical process, i.e. total change in the enthalpy of the system is independent of the

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Q. N.T.P. corresponds to

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Q. During a phase change process like sublimation, vaporisation, melting etc., the specific __________ does not change.

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Q. The boiling points for pure water and pure toluene are 100°C and 110.6°C respectively. Toluene and water are completely immiscible in each other. A well agitated equimolar mixture of toluene and water are prepared. If, at a total pressure of one standard atm. exerted by the vapours of water and toluene, the mole fraction of water Xw in the vapour phase satisfies

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Q. Colligative properties of a dilute solution are those, which depend entirely upon the

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Q. Viscosity of atmospheric air may be about __________ centipoise.

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Q. The osmotic pressure of a solution increases, if its __________ is decreased.

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Q. Pure aniline is evaporating through a stagnant air film of 1 mm thickness at 300 K and a total pressure of 100 KPa. The vapor pressure of aniline at 300 K is 0.1 KPa. The total molar concentration under these conditions is 40.1 mole/m³ . The diffusivity of aniline in air is 0.74x10⁻⁵ m²/s.The numerical value of mass transfer co-efficient is 7.4 x 10⁻³. The rate of evaporation of aniline is 2.97 x 10⁻⁴. Its units are

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Q. In osmosis through a semi-permeable membrane, diffusion of the

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Q. Heat of reaction is not influenced by

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Q. Pick out the wrong conversion formula for the conversion of weight units :

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Q. The elevation in boiling point of a solution is proportional to the __________ of the solution.

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Q. Pick out the wrong statement.

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Q. 1 Pascal (unit of pressure) is equal to __________ N/m².

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Q. In a binary liquid solution of components A and B, if component A exhibits positive deviation from Raoult's law, then component B

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Q. Avogadro number is the number of molecules in one __________ of a gas.

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Q. Number of gram equivalent of solute dissolved in one litre of solution is called its

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Q. The number of atoms of oxygen present in 11.2 litres of ozone (O₃) at N.T.P. are

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