NCERT Solutions Class 12 Chemistry Chapter 2 Solutions in text questions

1. Calculate the mass percentage of benzene (C6H6) and carbon tetrachloride (CCl4) if 22g of benzene is dissolved in 122g of carbon tetrachloride.

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2. Calculate the mole fraction of benzene in solution containing 30% by mass in carbon tetrachloride

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3. Calculate the molarity of each of the following solutions (a) 30g of CO(NO3)2.6H2O in 4.3 L of solution (b) 30 mL of 0.5 M H2SO4 diluted to 500ml.

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4. Calculate the mass of urea (NH2CONH2) required in making 2.5kg of 0.25 molar aqueous solution.

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5. Calculate (a) molality (b) molarity (c) mole fraction of KI if the density of 20% (mass / mass) aqueous KI is 1.202 g/ mL.

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6. H2S , a toxic gas with rotten egg like smell, is used for the qualitative analysis. If the solubility of H2S in water at STP is 0.195 m, calculate henry law constant.

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7. Henry law constant for CO2 in water is 1.67 x 108 Pa at 298K. Calculate the quantity of CO2 in 500 mL of soda water when packed under 2.5 atm CO2 pressure at 298K.

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8. The vapor pressure of pure liquids A and B are 450 and 700 mm Hg respectively, at 350K. Find out the composition of liquid mixture if total vapor pressure is 600mm Hg . Also, find the composition of vapor phase.

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9. Vapor pressure of pure water at 298K is 23.8mm Hg. 50 g of urea (NH2CONH2) is dissolved in 850 g of water. Calculate the vapor pressure of water for this solution and its relative lowering.

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Hence, the vapor pressure of water in solution is 23.4 mm of Hg and its relative lowering is 0.0173.

10. Boiling point of water at 750 mm Hg is 99.63°C. How much sucrose is to be added to 500g of water such that it boils at 100°C.

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11. Calculate the mass of ascorbic acid (Vitamin,C – C6H8O6) to be dissolved in 75g of acetic acid to lower its melting point by 1.5°C. Kf = 3.9 K Kg/mol.

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12. Calculate the osmotic pressure in pascals exerted by a solution prepared by dissolving 1.0 g of polymer of molar mass , 185,000 in 450 ml of water at 37°C.

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