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Solutions Test - 4

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Solutions Test - 4
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  • Question 1
    4 / -1

    The relative lowering in vapour pressure is proportional to the ratio of number of

    Solution

  • Question 2
    4 / -1

    Vapour pressure of a pure liquid X is 2 atm at 300 K. It is lowered to 1 atm on dissolving 1 g of Y in 20 g of liquid X. If molar mass of X is 200, what is the molar mass of Y?

    Solution

  • Question 3
    4 / -1

    An aqueous solution of 2% non - volatile solute exerts a pressure of 1.004 bar at the normal boiling point of the solvent. What is the molar mass of the solute?

    Solution

    Vapour pressure of pure water at boiling point (P∘) = 1 atm = 1.013 bar
    Vapour pressure of solution (Ps) = 1.004 bar
    Let Mass of solution = 100g
    Mass of solute = (w) = 2g
    Mass of solvent = 100 - 2 = 98g

  • Question 4
    4 / -1

    In the graph plotted between vapour pressure (V.P) and temperature (T).

    Solution

    PQ corresponds to increase in vapour pressure of solvent with temperature and XY corresponds to increase in vapour pressure of solution with temperature. ΔT is the elevation in boiling point of a solution.

  • Question 5
    4 / -1

    A solution containing 12.5g of non-electrolyte substance in 185g of water shows boiling point elevation of 0.80K. Calculate the molar mass of the substance. (Kb ​= 0.52K kg mol−1)

    Solution

  • Question 6
    4 / -1

    If 1g of solute (molar mass = 50g mol−1) is dissolved in 50g of solvent and the elevation in boiling point is 1K. The molar boiling constant of the solvent is?

    Solution

  • Question 7
    4 / -1

    2 g of sugar is added to one litre of water to give sugar solution. What is the effect of addition of sugar on the boiling point and freezing point of water?

    Solution

    When a non-volatile solute is added to water there is elevation in boiling point and depression is freezing point.

  • Question 8
    4 / -1

    Sprinkling of salt helps in clearing the snow-covered roads in hills. The phenomenon involved in the process is

    Solution

    When salt is spread over snow covered roads, snow starts melting from the surface because of the depression in freezing point of water and it helps in clearing the roads.

  • Question 9
    4 / -1

    Equimolar solutions in the same solvent have

    Solution

    Equimolal solutions show same colligative properties i.e., equal elevation in boiling point and equal depression in freezing point.

  • Question 10
    4 / -1

    A 5% solution (w/W) of cane sugar (molar mass = 342 g mol-1) has freezing point of 271 K. What will be the freezing point of a 5% glucose (molar mass = 18 g mol-1) in water if freezing point of pure water is 273.15 K?

    Solution


    For cane sugar solution, 2.15 K = 
    For glucose solution,


    Freezing point of glucose solution = 273.15 - 4.085 = 269.07 K

  • Question 11
    4 / -1

    What weight of glycerol should be added to 600g of water in order to lower its freezing point by 10∘C? (Kf = 1.86∘Cm−1)

    Solution

  • Question 12
    4 / -1

    The osmotic pressure of a solution can be increased by

    Solution


    Hence, π ∝ n

  • Question 13
    4 / -1

    Answer the following questions on the basis of given paragraph.
    Osmotic pressure is widely used to determine molar masses of proteins and polymers. Two solutions having same osmotic pressure are called isotonic solutions. Water can flow in or out from substance depending on if it is kept in hypotonic or hypertonic solutions. The direction of the osmosis can be reversed if a pressure larger than osmotic pressure is applied on solution side.

    Q. People taking lot of salt experience puffiness or swelling of the body due to

    Solution

    Due to osmosis water moves into the tissues and intercellular spaces causing retention of water.

  • Question 14
    4 / -1

    Answer the following questions on the basis of given paragraph.
    Osmotic pressure is widely used to determine molar masses of proteins and polymers. Two solutions having same osmotic pressure are called isotonic solutions. Water can flow in or out from substance depending on if it is kept in hypotonic or hypertonic solutions. The direction of the osmosis can be reversed if a pressure larger than osmotic pressure is applied on solution side.

    Q. The preservation of meat by salting and of fruits by adding sugar protects them from bacterial action because

    Solution

    The bacteria on salted meat or candid fruit loss water through osmosis, shrink and die.

  • Question 15
    4 / -1

    Answer the following questions on the basis of given paragraph.
    Osmotic pressure is widely used to determine molar masses of proteins and polymers. Two solutions having same osmotic pressure are called isotonic solutions. Water can flow in or out from substance depending on if it is kept in hypotonic or hypertonic solutions. The direction of the osmosis can be reversed if a pressure larger than osmotic pressure is applied on solution side.
    Q. Sea water is desalinated to get fresh water by which of the following methods?

    Solution

    Reverse osmosis is used for desalination of sea water.

  • Question 16
    4 / -1

    Which of the following statements is not correct?

    Solution

    With different solvents, the colligative properties change.

  • Question 17
    4 / -1

    10% solution of urea is isotonic with 6% solution of a non-volatile solute X.What is the molecular mass of solute X?

    Solution

    No. of moles of urea = 10/60 = 16
    Weight of solute, X = 6 g
    No. of moles of X = 6/M
    For isotonic solutions, n1 = n2
    or 1/6 = 6/M or M = 36 g mol−1

  • Question 18
    4 / -1

    A solution containing 10.2g glycerine per litre is isotonic with a 2% solution of glucose. What is the molecular mass of glycerine?

    Solution

    πglycerine = πglucose


    (Density of water = 1g/cm3)

  • Question 19
    4 / -1

    What will be the osmotic pressure in pascals exerted by a solution prepared by dissolving 1.0 g of polymer of molar mass 150,000 in 500 mL of water at 37∘C?

    Solution

    No. of moles of polymer

  • Question 20
    4 / -1

    Osmotic pressure of a solution containing 2g dissolved protein per 300cm2 of solution is 20mm of Hg at 27oC. The molecular mass of protein is

    Solution


    = 6239.6 g mol−1

  • Question 21
    4 / -1

    A solution is made by dissolving 20g of a substance in 500mL of water. Its osmotic pressure was found to be 600mm of Hg at 15∘C. Find the molecular weight of the substance.

    Solution


  • Question 22
    4 / -1

    Which of the following statements is not correct?

    Solution

    Both NaCl and KCl have different molecular masses.

  • Question 23
    4 / -1

    Grapes placed in three beakers X, Y and Z containing different type of solutions are shown in figures.

    If beaker X contains water, Y and Z contains:

    Solution

    In hypotonic solution, the water is drawn in and the grape swells while in hypertonic solution the water is drawn out and the grape shrinks.

  • Question 24
    4 / -1

    A plant cell shrinks when it is kept in a

    Solution

    Hypertonic solution has high osmotic pressure. When a plant cell is placed in hypertonic solution water will diffuse out of the cell resulting in shrinking of the cell.

  • Question 25
    4 / -1

    Which of the following statements is correct?

    Solution

    Solubility changes with temperature. A plant cell shrinks in hypertonic solution. Relative lowering of vapour pressure is a colligative property.

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