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*Comprehensive Chemistry Notes for Sale!* Unlock the molecular secrets with these detailed and organized chemistry notes! *Key Features:* - Clear explanations: Easy-to-understand concepts and reactions - Concise summaries: Key points and equations for quick revision - Practice problems: ...

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  • October 23, 2024
  • 4
  • 2024/2025
  • Exam (elaborations)
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CHEMISTRY

CLASS 12th

SOLUTION

SCHOLAR CLASSES

By- Bharat Sir

LONG QUESTIONS

1. Find the molality and molarity of a 15% solution of
when its density is 1.10 & molar mass = 98 amu.
2. Calculate the mole fraction of ethanol and water in a sample
of rectified spirit which contains 46% ethanol by
mass?
3. 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?
4. One litre of sea water weight 1030g and contains
about of dissolved . Calculate the concentration of
dissolved oxygen in ppm?
5. The density of 85% phosphoric acid is . What is the
volume of a solution that contains 17g of phosphoric acid?
6. Define the term azeotrope?
7. Obtain a relationship between relative lowering of vapour
pressure and mole fraction of solute?
8. Draw the graphs of both deviations from ideal behaviours?
9. A weak electrolyte AB in 5% dissociated in aqueous
solution? What is the freezing point of a 0.10 molar aqueous
solution of AB? Kf = 1.86 deg/molal?
10. Henry's law constant for the molality of methane in
benzene at 298 K is . Calculate the solubility of
methane in benzene at 298 K under 760 mm Hg.
11. Nalorphene , similar to morphine, is used to
combat withdrawal symptoms in narcotic users. Dose of

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