Page 1 CBSE TEST PAPER-01 CLASS - XII CHEMISTRY (Solutions) Topic: -Concentration of solutions 1. Define ‘solution’? [1] 2. Define the term ‘concentration? [1] 3. How does change in temperature changes the molarity and molality values? [1] 4. Calculate the volume of water which could be added to 20 ml of 0.65 m HCl to dilute the solution to 0.2 m? [2] 5. A solution is prepared by dissolving 11g glucose in 200 cm 3 water at 30 0 C. What is the mass Percentage of glucose in solution? The density of water 30 0 C is 0.996 glcm 3 ? [2] 6. Find the molality and molarity of a 15% solution of H 2SO 4 when its density is 1.10 glcm 3 & molar mass = 98 amu. [2] 7. Calculate the mole fraction of ethanol and water in a sample of rectified spirit which contains 46% ethanol by mass? [2] 8. Calculate the % composition in terms of mass of a solution obtained by mixing 300g of a 25% & 400 g of a 40% solution by mass? [2] 9. One litre of sea water weight 1030g and contains about 6×10 -3 g of dissolved 0 2. Calculate the concentration of dissolved oxygen in ppm? [2] 10. The density of 85% phosphoric acid is 1.70 g/cm 3 . What is the volume of a solution that contains 17g of phosphoric acid? [2]Read More

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