CBSE Guess > Papers > Important Questions > Class XII > 2007 > Chemistry > Solutions

Solutions

1. Concentrated nitric acid used in the laboratory work is 68% nitric acid by mass in aquous solution. What should be the molarity of such a sample of the acid if the density of the solution is 1.504 g/mL.
2. An antifreeze solution is prepared from 222.6g of ethylene glycol. C₂H₄(OH)₂ and 200g of water. Calculate molality of solution. If the density of the solution is 1.072 g/ml then what shall be the molarity of the solution?
3. What role does the molecular interaction play in solution of alchohol and water?
4. State Henry’s law and mention some important applications.
5. What is meant by positive and negative deviation from Raoults’ law and how is the sign DH related to positive & negative deviation from Raoults’ Law?
6. Heptane and octane form ideal solution. At 373K, the vapour pressures of the two liquid components are 105.2 Kpa and 46.8 Kpa, respectively. What will be the vapour pressure of a mixture of 25g of heptane and 35g of octane.
7. A solution containing 30g of non-volatile solute exactly in 90g water has a vapour pressure of 2.8 kPa at 298K. Calculate
   1) Molecular mass of solute Vapour pressure of water at 298K .
8. Two elements A & B form compounds having molecular formula AB₂ & AB₄. When dissolved in 20g of C₆H₆, 1g AB₂ lowers the freezing point by 2.3 & 1g AB₄ lowers it by 1.3K.The molar depression constant for benzene is 5.1Kg mol^-1. Calculate atomic mass A & B.
9. At 300k, 36g of glucose present per litre in its solution has an osmotic pressure of 4.98 bar. If the osmotic pressure of solution is 1.52 bar at the same temperature, what would be the concentration.

1. Atomic Structure and Chemical Bonding
2. Solid States
3. Solutions
4. Thermodoynamics
5. Chemical Kinetics
6. Nuclear Chemistry
7. Polymers
8. Biomolecules
9. Chemistry In Every Day Life