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Set 3 of 14 · Questions 61-90 of 419

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JEE Main Chemistry · Solutions · Set 3 (Q61-90)

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  1. 61.
    A solution has density . The molarity of the solution is nearly…………
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  2. 62.
    If 8 g of a non-electrolyte solute is dissolved in 114 g of n -octane to reduce its vapour pressure to , the molar mass (in ) of the solute is [Given that molar mass of n-octane is ]
    1. (1)60
    2. (2)80
    3. (3)20
    4. (4)40
  3. 63.
    Which of the following will form an ideal solution?
    1. (1) and
    2. (2) and
    3. (3) and
    4. (4) and
  4. 64.
    Assertion (A) : Blood cells collapse when suspended in saline waterReason (R) : Cell membrane dissolves in saline water
    1. (1)Both and are correct and is the correct explanation of
    2. (2)Both and are correct, but is not the correct explanation of
    3. (3)
    4. (4)
  5. 65.
    Relative lowering of vapour pressure of a dilute solution of glucose dissolved in of water is 0.002 . The molality of the solution is
    1. (1)0.004
    2. (2)0.222
    3. (3)0.111
    4. (4)0.021
  6. 66.
    A mixture of ethyl alcohol and propyl alcohol has a vapour pressure of 290 mm at 300 K. The vapour pressure of propyl alcohol is 200 mm. If the mole fraction of ethyl alcohol is 0.6, its vapour pressure (in mm) at the same temperature will be :
    1. (1)700
    2. (2)360
    3. (3)350
    4. (4)300
  7. 67.
    Blood cells retain their normal shape in solution which are
    1. (1)hypotonic to blood
    2. (2)isotonic to blood
    3. (3)hypertonic to blood
    4. (4)equinormal to blood.
  8. 68.
    of a compound, ' ' (molar mass ) is dissolved in of other compound, (molar mass = ). The ratio of mole fractions of and in the solution is
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  9. 69.
    At , the vapour pressure of pure benzene is 268 torr The number of moles of non-volatile solute per mole of benzene required to prepare a solution having a vapour pressure of 167 torr at the same temperature is (molar mass of benzene )
    1. (1)0.505
    2. (2)0.705
    3. (3)0.605
    4. (4)0.405
  10. 70.
    A solution containing 62 g ethylene glycol in 250 g water is cooled to . If for water is 1.86 K kg , the amount of water (in g) separated as ice is :
    1. (1)48
    2. (2)32
    3. (3)64
    4. (4)16
  11. 71.
    What is the weight in gram of molarmass present in of its solution?
    1. (1)0.53
    2. (2)5.3
    3. (3)1.06
    4. (4)10.6
  12. 72.
    Calculate the depression in freezing point of solution when non-volatile solute of molar mass dissolved in water. [Cryoscopic constant of water ]
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  13. 73.
    ' ' g of NaCl is added to water in a beaker with a lid. The temperature of the system is raised from to . Which out of the following plots, is best suited for the change in the molarity (M) of the solution with respect to temperature?
    [Consider the solubility of NaCl remains unchanged over the temperature range]
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  14. 74.
    The experimental depression in freezing point of a dilute solution is . If the van't Hoff factor (i) is 2.0 , the calculated depression in freezing point (in ) is
    1. (1)0.00125
    2. (2)0.025
    3. (3)0.0125
    4. (4)0.05
  15. 75.
    The concentration unit, independent of temperature, would be
    1. (1)normality
    2. (2)weight volume percent
    3. (3)molality
    4. (4)molarity
  16. 76.
    The measured osmotic pressure of a solution prepared by dissolving of in of water at is bar.
    The van't Hoff factor is bar ; atomic weights ,
    1. (1)2.84
    2. (2)3.0
    3. (3)2.0
    4. (4)2.32
  17. 77.
    of nitrogen gas dissolves in of water at and one atm pressure due to nitrogen gas. The mole fraction of nitrogen in of water at nitrogen pressure is approximately
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  18. 78.
    Dissolving of a compound (mol. ) in 1000 of water gave a solution of density . The molarity of solution is
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  19. 79.
    An aqueous dilute solution containing non-volatile solute boils at . What is the molality of solution?
    , boiling temperature of water
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  20. 80.
    1.00 of a non‐electrolyte solute (molar mass 250 was dissolved in 51.2 ofbenzene. If the freezing point depression constant, of benzene is 5.12 kg , the freezing point of benzene will be lowered by
    1. (1)0.2
    2. (2)0.4
    3. (3)0.3
    4. (4)0.5
  21. 81.
    ' of urea (molar mass ) is completely dissolved in ' ' of pure water and the solution boiled at . If the boiling point of pure water at is , then is
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  22. 82.
    The relation between solubility of a gas in liquid at constant temperature and external pressure is stated by which law?
    1. (1)Raoult's law
    2. (2)van't Hoff Boyle's law
    3. (3)van't Hoff Charles' law
    4. (4)Henry's law
  23. 83.
    The Van’t Hoff factor (i) for a dilute aqueous solution of the strong electrolyte barium hydroxide is
    1. (1)
    2. (2)1
    3. (3)2
    4. (4)3
  24. 84.
    Given below are two statements :
    Statement (I): NaCl is added to the ice at , present in the ice cream box to prevent the melting of ice cream.
    Statement (II): On addition of NaCl to ice at , there is a depression in freezing point.
    choose the correct answer from the options given below :
    1. (1)Both Statement I and Statement II are false
    2. (2)Statement I is false but Statement II is true
    3. (3)Statement I is true but Statement II is false
    4. (4)Both Statement I and Statement II are true
  25. 85.
    The freezing point (in ºC) of a solution containing 0.1 g of [Fe] (Mol. Wt. 329) in 100 g of water ( = 1.86 K kg ) is :
    1. (1)– 2.3 ×
    2. (2)– 5.7 ×
    3. (3)– 5.7 ×
    4. (4)– 1.2 ×
  26. 86.
    The observed and normal molar masses of compound are 65.6 and 164 respectively. The percent degree of ionisation of is …… . (Nearest integer)
  27. 87.
    A solution containing 2 g of a non-volatile solute in 20 g of water boils at 373,52 K. The molecular mass of the solute is _______ . (Nearest integer)
    Given, water boils at 373 K, for water = 0.
  28. 88.
    The Total pressure observed by mixing two liquid A and B is 350 mm Hg when their mole fractions are 0.7 and 0.3 respectively.
    The Total pressure becomes 410 mm Hg if the mole fractions are changed to 0.2 and 0.8 respectively for A and B. The vapour pressure of pure A is______mm Hg. (Nearest integer)Consider the liquids and solutions behave ideally,
  29. 89.
    224 mL of at 298 K and 1 is passed through 100 mL of 0.1MNaOH solution. The non-volatilesolute produced is dissolved in 36 g of water. The lowering of vapour pressure of solution (assuming thesolution is dilute) is mm of is of Hg, the value of x is (round off to nearest integer)
  30. 90.
    Elevation in boiling point for 1.5 molal solution of glucose in water is 4K. The depression in freezing point for 4.5 molal solution of glucose in water is 4K. The ratio of molal elevation constant to molal depression constant (/) is____.