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Chemistry Test 203

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Chemistry Test 203
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Weekly Quiz Competition
  • Question 1
    4 / -1

    Which of the following associated with isotonic solutions is not correct?

    Solution

    The solutions having the same osmatic pressure are called isotonic solution. They may not have same weight concentrations

     

  • Question 2
    4 / -1

    A solution having 4 g of polyvinyl chloride polymer in one litre of dioxane was found to have an osmotic pressure of 4.1×10-4 atmatm at 27℃. The approximate molecular weight of the polymer is:

    Solution

     

  • Question 3
    4 / -1

    100 g of liquid A (molar mass: 140 g mol-1) was dissolved in 1000 g of liquid B (molar mass:180 g mol-1). The vapour pressure of pure liquid B was found to be 500 torr. What will be the vapour pressure of pure liquid A and its vapour pressure in the solution, respectively, if the total vapour pressure of the solution is 475 torr?

    Solution

     

  • Question 4
    4 / -1

    The strongest reducing agent is:

    Solution

    H2S in the strongest reducing agent among these as the oxidation state of S is minimum in H2S i.e., –2.

     

  • Question 5
    4 / -1

    Two solutions with same solute-solvent system exerts osmotic pressures of 6 atm 2 atm at 300 K, respectively. If these are separated by a semipermeable membrane, which would be observed?

    Solution

    Osmotic movement of solvent occurs from dilute (lower osmotic pressure) to concentrated (higher osmotic pressure) solution.

     

  • Question 6
    4 / -1

    A zero order reaction is one whose rate is independent of

    Solution

    For zero order reaction, dx / dt = k [reactant]0

    Thus the rate of zero order reaction is independent of concentration of reactants.

     

  • Question 7
    4 / -1

    Which mixture of the solutions will lead to the formation of negatively charged colloidal [AgI]I− sol?

    Solution

    Generally charge present on the colloid is due to adsorption of common ion from dispersion medium.

    Millimole of KI is maximum in option (2) (50 × 2 = 100)

    so act as solvent and anion I− is adsorbed by the colloid Agl formed

     

  • Question 8
    4 / -1

    The coagulation values in millimoles per litre of the electrolytes used for the coagulation of As2S3 are given below:

    I. (NaCl) = 52,

    II. (BaCl2) = 0.69,

    III. (MgSO4) = 0.22

    The correct order of their coagulating power is

    Solution

    Coagulating power ∝ 1/Coagulationvalue

    Lower the coagulation value, higher is the coagulating power so, the correct order is : III > II > I

     

  • Question 9
    4 / -1

    4.0 g of NaOH is dissolved in 100 ml solution. The normality of the solution is

    Solution

    Normality = Moles of solute / Volume of solution in litre

    Given mass of solute = 4.0 g

    No. of moles of NaOH = 4/40

    Volume of solution = 100 ml = 100/1000 L

     

  • Question 10
    4 / -1

    Which of the following factor do not affect solubility of solid solute in liquid?

    Solution
    • An increase in temperature of the solution increases the solubility of a solid solute.
    • The amount of solute that dissolve depends on what type of solute it is.
    • For solids and liquid solutes, changes in pressure have practically no effect on solubility.

     

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