Vapour pressure of pure ‘A’ is 70 mm of Hg at 25°C. It forms an ideal solution with ‘B’ in which mole fraction of A is 0.8. If the vapour pressure of the solution is 84 mm of Hg at 25°C, the vapour pressure of pure ‘B’ at 25°C is
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When 20 g of naphthoic acid (C11H8O2) is dissolved in 50 g of benzene (Kf = 1.72 K kg mol–1) a freezing point depression of 2 K is observed. The Van’t Hoff factor ‘i’ is |
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A 6% solution of urea is isotonic with |
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1.65 grams of HCl is dissolved in 16.2 grams of water. The mole fraction of HCl in the resulting solution is |
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Molarity of a given orthophosphoric acid solution is 3 M. Its normality is |
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Which one is correct? |
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When 25 grams of a non–volatile solute is dissolved in 100 grams of water, the vapour pressure is lowered by 2.25 × 10–1 mm. If the vapour pressure of water at 20°C is 17.5 mm, what is the molecular weight of the solute? |
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Concentrated aqueous sulphuric acid is 98% H2SO4 by mass and has a density of 1.80 g mL–1. Volume of acid required to make one litre of 0.1 M H2SO4 is |
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Which of the following can be measured by the Ostwald–Walker dynamic method? |
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One gram of silver gets distributed between 10 cm3 of molten zinc and 100 cm3 of molten lead at 800°C. The percentage of silver still left in the lead layer is approximately |
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Two liquids X and Y form an ideal solution. At 300 K, vapour pressure of the solution containing 1 mole of X and 3 mole of Y is 550 mm Hg. At the same temperature, if 1 mole of Y is further added to this solution, vapour pressure (in mm Hg) ofX and Y in their pure states will be respectively |
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