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Solutions Test - 10
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Solutions Test - 10
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  • Question 1/15
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    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 )

     

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  • Question 2/15
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    The osmotic pressure of a solution can be increased by

     

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    Hence, π∝n

     

     

  • Question 3/15
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    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

     

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

     

     

  • Question 4/15
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    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

     

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

     

     

  • Question 5/15
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    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?

     

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    Reverse osmosis is used for desalination of sea water.

     

     

  • Question 6/15
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    Which of the following statements is not correct?

     

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    With different solvents, the colligative properties change.

     

     

  • Question 7/15
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    10% solution of urea is isotonic with 6% solution of a non-volatile solute X.What is the molecular mass of solute X?

     

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    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 8/15
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    A  solution containing 10.2g glycerine per litre is isotonic with a 2% solution of glucose. What is the molecular mass of glycerine?

     

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    πglycerine = πglucose


    (Density of water = 1g/cm3 )

     

     

  • Question 9/15
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    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?

     

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    No. of moles of polymer

     

     

  • Question 10/15
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    Osmotic pressure of a solution containing 2g dissolved protein per 300cm2 of solution is 20mm of Hg at 27o C. The molecular mass of protein is

     

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    = 6239.6 g mol−1

     

     

  • Question 11/15
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    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.

     

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  • Question 12/15
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    Which of the following statements is not correct?

     

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    Both NaCl and KCl have different molecular masses.

     

     

  • Question 13/15
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    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:

     

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    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 14/15
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    A  plant cell shrinks when it is kept in a

     

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    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 15/15
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    Which of the following statements is correct?

     

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

     

     

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