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Solutions Test 3

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Solutions Test 3
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  • Question 1
    1 / -0

    Solubility of gas decreases with

    Solution

    For Gases, solubility decreases as temperature increases. The physical reason for this is that when most gases dissolve in solution, the process is exothermic. This means that heat is released as the gas dissolves.

  • Question 2
    1 / -0

    Solubility of which gas is maximum in water?

    Solution

    NH3 forms hydrogen Bonding with water.

  • Question 3
    1 / -0

    Molality is preferred over molarity in handling solutions in chemistry laboratory because

    Solution

    Molarity is number of moles per unit volume of the solution and molality is number of moles per unit mass of solvent. Volume is temperature dependent where as mass is constant at all temperatures. So, molality remains constant but molarity changes with temperature. Hence , molality is preferred over molarity.

  • Question 4
    1 / -0

    Aquatic animals are more comfortable in cold water rather that warm water because

    Solution

    The amount of dissolved oxygen in water decreases with rise in the water's temperature. Cold water has more dissolved oxygen per unit area than warm water. This the reason why aquatic animals are more comfortable in cold water than warm water.

  • Question 5
    1 / -0

    The molal depression constant depends upon

    Solution

    Molal depression constant : It is defined as the depression in freezing point when the molality of the solution is unity, i.e., one mole of the solute is dissolved in 1000 gram or 1 kilogram of the solvent.

  • Question 6
    1 / -0

    In the depression of freezing point experiment, it is found that

    Solution

    Addition of non volatile solute decreases the vapour pressure.

  • Question 7
    1 / -0

    If the temperature of an aqueous solution increases, it will cause

    Solution

    As temperature increases volume also increases and so Molarity decrease.

  • Question 8
    1 / -0

    Solution is defined as

    Solution

    Solution is Homogeneous mixture of Solute and Solvent.

  • Question 9
    1 / -0

    Amalgam of mercury with sodium is an example of

    Solution

    Solute is mercury( liquid) and solvent is sodium.

  • Question 10
    1 / -0

    Which among the following is miscible in each other?

    Solution

    Methanol and Water both are Polar. There is intermolecular Hydrogen Bonding interaction.

  • Question 11
    1 / -0

    Which among the following is an example of liquid in solid?

    Solution

    Hydrated salts have water molecule of hydration as solute.

  • Question 12
    1 / -0

    Which among the following is an example of a solid solution in which the solute is a gas?

    Solution

    Pumice stone is example of gas in Solid.

  • Question 13
    1 / -0

    The type of intermolecular interaction present in n-Hexane and n-Octane is

    Solution

    Both are Non Polar.

  • Question 14
    1 / -0

    Mathematical expression relating molarity and molality is

    Solution

    m = moles of solute / mass of solvent. M = moles of solute / volume of solution.

  • Question 15
    1 / -0

    The tanks used by divers are filled with air diluted with

    Solution

    Size of Helium is small so does not causes “Bents” to divers when the dive back to surface.

  • Question 16
    1 / -0

    Ethylene glycol is added to water as antifreeze. It will

    Solution

    Adding ethylene glycol to water reduces the freezing point of water. Water freezes at temperatures much less than 0 degree Celsius when ethylene glycol is added to it. It is used as an anti-freeze

  • Question 17
    1 / -0

    Which of the following solutions of H2SO4 is more concentrated?

    Solution

    The correct answer is option A
    1 M H2SO4 solution is more concentrated than 1 N acid solution. Actually 1M solution of acid is prepared by dissolving 98 g of the acid (1 gram mole) per litre of the solution while 1 N solution of acid is prepared by dissolving 49 g of the acid (1 gram equivalent) in the same volume of the solution.

  • Question 18
    1 / -0

    An aqueous solution of methanol and water has vapour pressure

    Solution

    They show positive deviation.

  • Question 19
    1 / -0

    Which has highest freezing point at 1 atm?  

    Solution

    Sugar solution has i=1 so ΔTf minimum so Tf will be maximum.

  • Question 20
    1 / -0

    A solution showing a large positive deviation from ideal behaviour has 

    Solution

    A solution showing a large positive deviation from ideal behaviour shows lower boiling point than both the components.

  • Question 21
    1 / -0

    Solution of hydrogen in palladium is an example of

    Solution

    Hydrogen (solute , gas ) and solvent is palladium (solid).

  • Question 22
    1 / -0

    In which unit, the concentration of solution remains independent of temperature

    Solution

    It is independent of volume hence independent of Temperature.

  • Question 23
    1 / -0

    6.3 g oxalic acid is used to make 250 mL aqueous solution .The volume of 0.1N NaOH solution required to neutralize completely 10 mL of this solution is

    Solution

    v2 = 40 ml

  • Question 24
    1 / -0

    The depression in freezing point for 1M urea, 1 M glucose and 1 M NaCl are in the ratio of

    Solution

    NaCl has i = 2 while urea and glucose will have i = 1

  • Question 25
    1 / -0

    25ml of a solution of barium hydroxide titration with 0.1molar solution of hydro-chloric acid gave a titre value of 35ml.The molarity of barium hydroxide is

    Solution

    Ba(OH)2 + 2HCI → BaCl2 + 2H2O

    M1V1X1 →  M2V2X2 

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