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  • Question 1
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    Liquids A and B forms an ideal solution . At TK , PA0=0.4bar P^0_A = 0.4\, bar and PB0=0.6bar P^0_B = 0.6\, bar . In a cylinder piston arrangement, 2.0 moles of vapours of liquid A and 3.0 moles of vapours of liquid B are taken at TK and 0.3 bar

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    Which of the following is the only incorrect informarion regarding the composition of the system at 0.51 bar pressure ?

  • Question 2
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    Directions For Questions

    Liquids A and B forms an ideal solution . At TK , PA0=0.4bar P^0_A = 0.4\, bar and PB0=0.6bar P^0_B = 0.6\, bar . In a cylinder piston arrangement, 2.0 moles of vapours of liquid A and 3.0 moles of vapours of liquid B are taken at TK and 0.3 bar

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    If the vapour are compressed slowly and isothermally , at what pressure , the first drop of liquid will appear ?

  • Question 3
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    One having high vapour pressure at temperature below its melting point is?

  • Question 4
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    2.0 g2.0\ g mixture of sodium carbonate and sodium bicarbonate on heating to constant weight gave 224 mL224\ mL of CO2CO_{2} at N.T.P.
    The %\% weight of sodium bicarbonate in the mixture is:

  • Question 5
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    The compound Na2CO3.xH2ONa_2 CO_3 . x H_2O has 50 % H2O50  \%  H_2O by mass. The value of "x" is :

  • Question 6
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    Liquid A ( molar mass = 100 g/mol and density = 1.25 g/ml ) and B ( molar mass = 50 g/mol and density = 1.0 g/ml) form an ideal solution . the molal volume of liquid A increases by afactor of 3800 as it vaporizes at 270 27^0 C and that of liquid B increases by factor of 7600 at 270C 27^0 C A solution of liquid A and B at 270C 27^0 C has a vapour pressure of 54.0 (n R -= 0.08 atm/K-mol ) 

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    The vapour pressure of pure liquid A at 270C 27^0 C is

  • Question 7
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    Directions For Questions

    The lowering vapour pressure on adding non volatile solute in a pure liquid solvent may be measured by ostwald walker method. in this method dry air is first passed through a series of vessels having the solution, then through a series of vessels having pure solvent and finally through a vessel ( normally U Tube) having the absorbent of the solvent.the masses of the solution and pure solvent decreases due to removal of vapour of solvent in the flow of air and the m,ass of absorbent increases due to absorption of the vapour of solvent , in order to make the air, dery . by measuring the changes in mass we may determine the lowering of vapour pressure and hence, the composition of solution using raoults law.

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    If the experimenty is performed aqueous AlCl3 AlCl_3 solution (a= 0.8 ) prepared by dissolving 1 mole of AlCl3 AlCl_3 in 17 mole of water and the decrease in the mass of solution in the experiment is found to be 0.18 g then the increase in the mass of absorbent should be

  • Question 8
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    At 80oC80^o C, the vapour pressure of pure liquid A is 520 mm Hg and that of pure liquid B is 1000 mm Hg. If a mixture solution of A and B boils at 80oC80^o Cand 1 atm pressure, the amount of A in the mixture is :

    (1 atm=760 mm Hg)

  • Question 9
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    Sugar in urine sample can be detected by:

  • Question 10
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    50mL50 mL of solution of Na2CO3 Na_2CO_3 neutralizes 49.35mL49.35 mL of 4N HCl4 N \ HCl . the reaction is represented as 
    CO32+2H+CO2+H2O CO^{2-}_3 +2H^+ \rightarrow CO_2 +H_2O
    The density of this Na2CO3 Na_2CO_3 solution is 1.25 g mL1, mL^{-1} , the percentage of  Na2CO3  Na_2CO_3 in it is :

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