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Set 5 of 14 · Questions 121-150 of 419

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JEE Main Chemistry · Solutions · Set 5 (Q121-150)

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  1. 121.
    The molarity of one molal glucose solution having density of is
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  2. 122.
    The mass of a non-volatile solute of molar mass that should be dissolved in of octane to lower its vapour pressure by is
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  3. 123.
    Benzene and naphthalene form an ideal solution at room temperature. For this process, the true statement(s) is (are) :
    1. (1)ΔG is positive
    2. (2)ΔSsystem is positive
    3. (3)ΔSsurroundings = 0
    4. (4)ΔH = 0
  4. 124.
    If of is dissolved to make solution at , the molarity at is
    1. (1)
    2. (2)
    3. (3)
    4. (4) M
  5. 125.
    Which of the following can be measured by the Ostwald-Walker dynamic method?
    1. (1)Vapour pressure of the solvent
    2. (2)Relative lowering of vapour pressure
    3. (3)Lowering of vapour pressure
    4. (4)All of these
  6. 126.
    Two liquids A and B form an ideal solution at temperature T K. At T K, the vapour pressures of pure A and B are 55 and respectively. What is the mole fraction of in solution of and in equilibrium with a vapour in which the mole fraction of A is 0.8?
    1. (1)0.340
    2. (2)0.663
    3. (3)0.5217
    4. (4)0.480
  7. 127.
    Consider separate solution of 0.500 M OH(aq), 0.100 M (aq), 0.250 M KBr(aq) and 0.125 M (aq) at 25°C. Which statement is true about these solution, assuming all salts to be strong electrolytes ?
    1. (1)They all have the same osmotic pressure.
    2. (2)0.100 M (aq) has the highest osmotic pressure.
    3. (3)0.125 M (aq) has the highest osmotic pressure.
    4. (4)0.500 M OH(aq) has the highest osmotic pressure
  8. 128.
    Which of the following solution has the highest freezing point?
    1. (1) in water
    2. (2) in 1 kg water
    3. (3) Urea in 1 kg water
    4. (4) of glucose in 1 kg water
  9. 129.
    The molarity of urea (molar mass ) solution by dissolving of urea in of water is
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  10. 130.
    How many of dibasic acid (mol. weight 200) should be present in 100 of the aqueous solution to give strength of 0.1 ?
    1. (1)10
    2. (2)2
    3. (3)1
    4. (4)20
  11. 131.
    If molality of the dilute solution is doubled, the value of molal depression constant (K) will be
    1. (1)halved
    2. (2)tripled
    3. (3)unchanged
    4. (4)doubled.
  12. 132.
    A flask contains a mixture of isohexane and -methylpentane. One of the liquids boils at whilethe other boils at . What is the best way to seperate the two liquids and which one will be distilledout first?
    1. (1)Simple distillation and isohexane.
    2. (2)Fractional distillation and isohexane.
    3. (3)Simple distillation and -Methylpantane.
    4. (4)Fractional distillation and -Methylpantane.
  13. 133.
    if ofa solute, dissolved in 15 ofsolvent, is boiled at a temperature higher by than that ofthe pure solvent. The molecular weight of the substance (Molal elevation constant for the solvent is 2. ) is
    1. (1)10.1
    2. (2)100
    3. (3)1.01
    4. (4)1000
  14. 134.
    of glucose is dissolved in of water. The relative lowering of vapour pressure of the solution is equal to
    1. (1)6
    2. (2)0.2
    3. (3)5.1
    4. (4)0.02
  15. 135.
    We have three aqueous solutions of labelled as ' and ' with concentration , , respectively. The value of van factor (i) for these solutions will be in the order.
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  16. 136.
    In one molal solution that contains 0.5 mole of a solute, there is
    1. (1)1000 g of solvent
    2. (2)500 mL of solvent
    3. (3)500 g of solvent
    4. (4)100 mL of solvent
  17. 137.
    Solution ' ' contains acetone dissolved in chloroform and solution ' ' contains acetone dissolved in carbon disulphide. The type of deviations from Raoult's law shown by solutions and , respectively are
    1. (1)positive and positive
    2. (2)positive and negative
    3. (3)negative and negative
    4. (4)negative and positive.
  18. 138.
    A set of solutions is prepared using of water as a solvent and of different nonvolatile solutes and . The relative lowering of vapour pressure in the presence of these solutes are in the order [Given, molar mass of
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  19. 139.
    The molality (in ) of 1 mole of solute in of solvent is
    1. (1)10
    2. (2)20
    3. (3)30
    4. (4)40
  20. 140.
    A non-volatile solute ' ' tetramerises in water to the extent of of ' ' in of water, lowers the freezing point by . The molar mass of in is ( for water )
    1. (1)62
    2. (2)221
    3. (3)155
    4. (4)354
  21. 141.
    Which of the following aqueous solution has minimum freezing point?
    1. (1)0.01 m NaCl
    2. (2)0.005 CHOH
    3. (3)0.005
    4. (4)0.005
  22. 142.
    Identify the compound amongst the following of which aqueous solution has highest boiling point.
    1. (1)Glucose
    2. (2)Sodium chloride
    3. (3)Calcium chloride
    4. (4)Ferric chloride
  23. 143.
    The mass of glucose that should be dissolved in of water in order to produce the same lowering of vapour pressure as is produced by dissolving of urea in the same quantity of water is
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  24. 144.
    2 moles each of ethylene glycol and glucose are dissolved in 500 g of water. The boiling point of the resulting solution is: (Given: Ebullioscopic constant of water )
    1. (1)377.3 K
    2. (2)379.2 K
    3. (3)375.3 K
    4. (4)277.3 K
  25. 145.
    The molarity of solution will be
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  26. 146.
    A 0.5 percent solution of potassium chloride was found to freeze at -0.24°C. The percentage dissociation of potassium chloride is ________.
    (Nearest integer)(Molal depression constant for water is 1.80 K kg and molar mass of KC1 is 74.6 g )
  27. 147.
    At , the vapour pressure of benzene is 70 torr and that of methyl benzene is 20 torr. The mole fraction of benzene in the vapour phase at above an equimolar mixture of benzene and methyl benzene is ___ . (Nearest integer)
  28. 148.
    A gaseous mixture of two substances A and B, under a total pressure of 0.8 atm is in equilibrium with an ideal liquid solution. The mole fraction of substance A is 0.5 in the vapour phase and 0.2 in the liquid phase. The vapour pressure of pure liquid A is_______atm. (Nearest integer)
  29. 149.
    molal solution of a weak acid has a freezing point of . The degree of dissociation of this acid is ____ . (Round off to the Nearest Integer).
    [Given : Molal depression constant of water Freezing point of pure water ]
  30. 150.
    When 9.45 ofis added to 500mL of water, its freezing point drops by 0.5 °C. The dissociation constant of is . The value of x is ____ (Rounded off to the nearestinteger)