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Solutions Test - 4

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Solutions Test - 4
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  • Question 1
    1 / -0.25

     

    Assertion: Soft drinks and soda water bottles are sealed under high pressure.
    Reason: High pressure maintains the taste and texture of soft drinks.

     

    Solution

     

     

    The correct option is  A

    Assertion is true, but the reason is false.
    Explanation for Assertion:-

    • The soda drinks and soda waters are sealed under high pressure.
    • This increases, the solubility of the Carbon dioxide(CO2).

    Explanation for Reason:-

    • According to Henry 's law, the partial pressure of the gas is directly proportional to the solubility of the gas.
    • That is more the pressure of the gas more will be the solubility of the gas.
    • Thus, due to this, to increase the solubility of  (CO2), the bottles are sealed under high pressure.
    • It is not done to improve or maintain the taste or texture of the sodas or drinks.

    Therefore, option (A) Assertion is true, but the reason is false is the correct answer.

     

     

  • Question 2
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    Statement I Scuba (instrum ent used for breathing) divers must cope with high concentration of dissolved gases while breathing at high pressure under water.

    Statement II Formation of bubbles in blood blocks capillaries and creates bends which are painful and dangerous to life.

     

    Solution

     

     

    (a) When divers breathe under high pressure, solubility of atmospheric gases in blood increases. When divers come at the surface, pressure gradually decreases. Gases (N2 and 02 ) are released in the form of bubbles which blocks capillaries and creates a medical symptoms called bends which are painful and dangerous. To avoid bends as well as toxic effects of high concentration of nitrogen in the blood, the tanks used by divers are filled with air diluted with helium (11.7% He, 56.2% N2 and 32.1% Og). Thus, both Statements I and II are correct and Statement II is the correct explanation of Statement I.

     

     

  • Question 3
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    Matching List Type
    Choices for the correct combination of elements from Column I and Column II are given as options (a), (b), (c) and (d), out of which one is correct

     

    The major components of air are 02 and N2 with approximate proportion of 21% and 79% by volume at 298 K. The water is in equilibrium with air at a pressure of 10 atm. At 298 K, KH (N2 ) = 6.5 1 x 107 mm, KH ( 02 ) = 3.30 x 107 mm Match the parameters in Column I with their values in Column II and select the answer from the codes given below.

    Codes:

     

    Solution

     

     

     

     

  • Question 4
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    This section contains a graph describing theory, experiments, data, etc. Two questions related to the paragraph have been given. Each question has only one correct answer out of the given 4 options (a), (b), (c) and (d)

    Passage

    Q. Henry ’s law constant for HCI gas is (in torr)

     

    Solution

     

     

    Based on given figure, pressure of  

     

     

  • Question 5
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    The value for Henry ’s constant for helium, hydrogen, nitrogen and oxygen at 293 K are 144.97 kbar, 69.16 kbar, 76.48 kbar and 34.86 kbar respectively. Which of the gas will be having maximum solubility?

     

    Solution

     

     

    The correct answer is option B.

    At a constant pressure KH is inversely proportional to x therefore higher the KH lower the solubility.
    The increasing solubility order is:
    He 2 2 2
     

     

     

  • Question 6
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    A solution in which no more solute can be dissolved at a given temperature and pressure is called a saturated solution. At saturated solution stage equilibrium gets established among which two processes?

     

    Solution

     

     

    At saturated solution stage equilibrium gets established among dissolution and crystallisation.

     

     

  • Question 7
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    A solution in which no more solute can be dissolved at the given temperature and pressure is called a

     

    Solution

     

     

    The correct answer is option  D
    In a saturated solution, more solute cannot be dissolved at a given temperature.
    This is because, the solute dissolves in a solvent because of space between particles of solvent but on continuous addition of solute, the space between the solvent particles gets fulfilled. Thus no more solute particle can dissolve in a solvent.

     

     

  • Question 8
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    Which expression correctly represents Henry ’s Law?

     

    Solution

     

     

    The correct answer is option A
    Henry ’s law is a gas law which states that the amount of gas that is dissolved in a liquid is directly proportional to the partial pressure of that gas above the liquid when the temperature is kept constant. The constant of proportionality for this relationship is called Henry ’s law constant (usually denoted by ‘kH ‘). The mathematical formula of Henry ’s law is given by:
    P ∝C (or) P = kH .C
    Where,
     

    • ‘P ’denotes the partial pressure of the gas in the atmosphere above the liquid.

    • ‘C ’denotes the concentration of the dissolved gas.

    • ‘kH ’is the Henry ’s law constant of the gas.

    This law was formulated in the early 19th century by the English chemist William Henry. It can be noted that Henry 's law constant can be expressed in two different ways. If the constant is defined in terms of solubility/pressure, it is referred to as the Henry ’s law solubility constant (denoted by ‘H ’). On the other hand, if the proportionality constant is defined in terms of pressure/solubility, it is called the Henry ’s law volatility constant (denoted by ‘kH ’).

     

     

  • Question 9
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    Value of Henry ’s constant KH is ______.

     

    Solution

     

     

    The correct answer is option A

    According to Henry 's law, solubility of a gas in a liquid is directly proportional to pressure of gas.
    P αX
    P = KH X
    P = Partial pressure of gas
    X = solubility of gas in liquid
    KH = Henry 's constant
    KH depends only on the nature of gas, nature of liquid and temperature (T). As temperature increases, 'KH 'increases and 'X 'decreases.

     

     

  • Question 10
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    Some solute particles in solution collide with other solid solute particles present and get separated out of solution. This process is known as

     

  • Question 11
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    The value for Henry ’s constant for argon, carbon dioxide, methane and vinyl chloride at 298 K are 40.3 kbar, 1.67 kbar, 0.413 kbar and 0.611 kbar respectively. Which of the gas will be having least solubility?

     

    Solution

     

     

    The correct answer is Option A
    The higher the value of KH, the lower is the solubility of the gas in the liquid. Hence the order of increasing solubility of the gases will be Ar < CO2 4

     

  • Question 12
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    Which of the following gases will be least soluble in water?

     

  • Question 13
    1 / -0.25

     

    According to Henry ’s Law at a constant temperature the solubility of gas in a liquid is directly proportional to the

     

    Solution

     

     

    The correct answer is option D
    Henry 's law states that at a constant temperature, the solubility of a gas is directly proportional to the pressure of the gas.
    In other words, The partial pressure of the gas in vapour phase (p) is proportional to the mole fraction of the gas (x) in the solution.
    p=KH ​x
    Here, KH ​is Henry 's law constant.
    Hence, the given statement is Henry 's law.

     

     

  • Question 14
    1 / -0.25

     

    When a large amount of solute dissolves in a given amount of solvent it forms

     

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