Most important question pseb board for class 12 chapter solution
1.Commercially available concentrated HCl contain 38% HCl by mass and has a density 1.19 g/mL. Calculate molarity of this acid.
2. The density of 10% by mass of KCl solution in the water is 1.06 g/mL. Calculate molarity of this solution.
3. The boiling point of benzene is 353.23 K. When 1.80 g of a non-volatile salute was dissolved in 90 g of benzene, the boiling point is raised to 354.11 K. Calculate the molar mass of salute.( Kb for benzene 2.53 K Kg/mol)
4. 45g of ethylene glycol(C2H6O2) is mixed with 600 g of water. Calculate the freezing point depression.(Kf for water 1.86K Kg/mol)
5. 18 g of glucose is dissolved in 1KG of water. At what temperature will solution boil? Kb for water is 0.52K Kg/mol)
6. Calculate the molar concentration of urea solution if it exert an osmotic pressure of 2.45 atm at 300K.
7. 15 g of an unknown molecular substance was dissolved in 450 g of water. The resulting solution freezes add -0.34ﾟC what is the molar mass of the substance?
8. Addition of 0.643 g of a compound to 43.95 g of solvent lowers the freezing point from 5.51ﾟC to 5.03ﾟC. If the Kf for solvent is 5.12K Kg/mol. Calculate the molar mass of the compound.
9. 10 gram of a non volatile salute when dissolved in 100 gram of benzene raises it's boiling point by 1ﾟ. What is the molecular mass of the salute?( Kb for benzene 2.53 K Kg/mol)
10. Concentrated Sulphuric acid has a density of 1.9 g/mL and is 99% H2SO4 by weight. calculate molarity of sulphuric acid.
11. A commercially available sample of sulphuric acid is 15% H2SO4 by weight (density= 1.10 g/mole) Calculate molarity of the solution.
12. Commercially available HCl is 38% by mass calculate its molality.
