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Solutions Test - 8

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Solutions Test - 8
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  • Question 1
    1 / -0

    Which of the following aqueous solutions is expected to have the highest boiling point?

    Solution

    Although all the given solutions have the same molarity and all the options are electrolytes yet the number of ions produced in the solution are different in each case.
    The van't Hoff factor is the highest (= 3) for Na2SO4 and hence, there is a maximum number of particles of the non-voatile solute in the solution and the change in the colligative property will be the maximum.
    Hence, 0.1 M solution of Na2SO4 will show the maximum elevation in the boiling point.

     

  • Question 2
    1 / -0

    Which of the following is not a colligative property?

    Solution

    Vapour pressure is not a colligative property but relative lowering of the vapour pressure on addition of a non volatile solute is.

     

  • Question 3
    1 / -0

    The boiling point of a solution at a height of 10 km above the sea level is

    Solution

    At 10 km above the sea level, the atmospheric pressure will be less than that existing at the sea level. Hence, the boiling point of the solution will be less.

     

  • Question 4
    1 / -0

    The freezing point of equimolal solution will be the lowest for

    Solution

    Sodium phosphate (Na3PO4) is a strong electrolyte and will furnish 4 moles of ions per mole of the salt in its aqueous solution.
    Therefore, the van't Hoff factor is the highest for Na3PO4 and the depression in the freezing point will be the maximum in the solution of this compound..

     

  • Question 5
    1 / -0

    In the phenomenon of osmosis through semi-permeable membrane,

    Solution

    Osmosis is the spontaneous net movement of solvent molecules through a semi-permeable membrane into a region of higher solute concentration, in the direction that tends to equalise the solute concentrations on the two sides.

     

  • Question 6
    1 / -0

    The osmotic pressure of 0.1 M sodium chloride solution at 27°C is

    Solution

    Osmostic pressure, π = CRT
    = (2 x 0.1 mol L–1)(0.082 atm L K–1mol–1)(300 K)
    = 4.92 atm

     

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