A very dilute solution is prepared by dissolving ‘x1’ mole of solute in ‘x2’ mole of a solvent. The mole fraction of solute is approximately equal to_________________?

Related Mcqs:

1. The vapor pressure of the solvent decreased by 10 mm Hg, when a non-volatile solute was added to the solvent. The mole fraction of the solute in the solution is 0.2. What should be the mole fraction of the solvent, if the decrease in vapor pressure of the solvent is required to be 20 mm Hg ?

   A. 0.2
   B. 0.1
   C. 0.4
   D. 0.6

2. Osmotic pressure exerted by a solution prepared by dissolving one gram mole of a solute in 22.4 litres of a solvent at 0°C will be _______________ atmosphere?

   A. 0.5
   B. 1
   C. 1.5
   D. 2

3. A solution is made by dissolving 1 kilo mole of solute in 2000 kg of solvent. The molality of the solution is_________________?

   A. 2
   B. 1
   C. 0.5
   D. 0.05

4. The vapour pressure of a solution (made by dissolving a solute in a solvent) is ____________ that of the pure solvent?

   A. Less than
   B. More than
   C. Equal to
   D. Either more or less; depends on the solvent

5. Vapor pressure of a solution is proportional to (where, Sv and St are mole fraction of solvent and solute respectively) ?

   A. Sv
   B. 1/St
   C. St
   D. 1/Sv

6. Osmotic pressure of a dilute solution of a non volatile solute in a solvent obeying Raoult’s law is proportional to the_____________?

   A. Temperature
   B. Volume of solution
   C. Moles of non-volatile solute
   D. None of these

7. Dissolving a solute in a solvent does not change its________________?

   A. Specific heat
   B. Vapour pressure
   C. Viscosity
   D. None of these

8. One mole of methane undergoes complete combustion in a stoichiometric amount of air. The reaction proceeds as CH4 + 2O2 → CO2 + 2H2O. Both the reactants and products are in gas phase. ΔH°298 = – 730 kJ/mole of methane. Mole fraction of water vapour in the product gases is about_____________________?

   A. 0.19
   B. 0.33
   C. 0.40
   D. 0.67

9. The accumulation in a steady state combustion process, burning 1 kg mole of carbon with 1 kg mole of oxygen thereby producing 1 kg mole of carbon dioxide, is _____________ kg mole?

   A. 1
   B. 0
   C. 16
   D. 44

10. The weight fraction of methanol in an aqueous solution is 0.64. The mole fraction of methanol XM satisfies________________?

    A. XM < 0.5
    B. XM = 0.5
    C. 0.5 < XM < 0.64
    D. XM ≥ 0.64