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Solutions Test 15

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Solutions Test 15
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  • Question 1
    1 / -0

    Directions: This questions consist of two statements, each printed as Assertion and Reason. While answering this questions, you are required to choose any one of the following four responses.

    Assertion : Molarity of a solution in liquid state changes with temperature.
    Reason : The volume of a solution changes with change in temperature.

    Solution

    Assertion and reason both are correct statements and reason is the correct explanation of assertion. Volume of solutions Is a function of temperature which varies with temperature. Hence, the molarity of solution in liquid state changes with temperature.
    Molarity = moles of Solute/Volume of solution litra

  • Question 2
    1 / -0

    Directions: This questions consist of two statements, each printed as Assertion and Reason. While answering this questions, you are required to choose any one of the following four responses.

    Assertion : Molarity of a solution in liquid state changes with temperature.
    Reason : The volume of a solution changes with change in temperature.

    Solution

    A molar solution is more concentrated than molal solution because 1 molar solution contains 1 mole of solute in 1 litre of the solution which include both solute and solvent.

  • Question 3
    1 / -0

    Directions: This questions consist of two statements, each printed as Assertion and Reason. While answering this questions, you are required to choose any one of the following four responses.

    Assertion : If a liquid solute more volatile than the solvent is added to the solvent, the vapour pressure of the solution may increase i.e., ps > po.
    Reason : In the presence of a more volatile liquid solute, only the solute will form the vapours and solvent will not.

    Solution

    Both the solute and solvent will form the vapours but vapour phase will become richer in the more volatile component.

  • Question 4
    1 / -0

    Directions: This questions consist of two statements, each printed as Assertion and Reason. While answering this questions, you are required to choose any one of the following four responses.

    Assertion (A): Molarity of 0.1 N solution of HCl is 0.1 M.
    Reason (R): Normality and molarity of a solution are always equal.

    Solution

    Normality and molarity of a solution are not always equal. Normality depends on chemical  equivalent of the substance while molarity depends on the molecular mass of the substance.

  • Question 5
    1 / -0

    Directions: This questions consist of two statements, each printed as Assertion and Reason. While answering this questions, you are required to choose any one of the following four responses.

    Assertion : If one component of a solution obeys Raoult’s law over a certain range of composition, the other component will not obey Henry’s law in that range.
    Reason : Raoult’s law is a special case of Henry’s law.

    Solution

    Raoult's law holds over the entire concentration range x = 0 to 1 in a binary solution then, for the second component, the same must also hold.
    If deviations from the ideal are not too large, Raoult's law is still valid in a narrow concentration range when approaching x = 1.  for the majority phase (the solvent)  The solute also shows a linear limiting law, but with a different coefficient. This law is known as Henry's Law.

  • Question 6
    1 / -0

    Directions: This questions consist of two statements, each printed as Assertion and Reason. While answering this questions, you are required to choose any one of the following four responses.

    Assertion : Azeotropic mixtures are formed only by non-ideal solutions and they may have boiling points either greater than both the components or less than both the components.
    Reason : The composition of the vapour phase is same as that of the liquid phase of an azeotropic mixture.

    Solution

    Non-ideal solutions with positive deviation i.e., having more vapour pressure than expected, boil at lower temperature while those with negative deviation boil at higher temperature than those of the components.

  • Question 7
    1 / -0

    Directions: This questions consist of two statements, each printed as Assertion and Reason. While answering this questions, you are required to choose any one of the following four responses.

    Assertion (A): Molarity of a solution in liquid state changes with temperature.
    Reason (R): The volume of a solution changes with change in temperature.

    Solution

    Molarity changes with temperature because volume changes with temperature.

  • Question 8
    1 / -0

    Directions: This questions consist of two statements, each printed as Assertion and Reason. While answering this questions, you are required to choose any one of the following four responses.

    Assertion : When methyl alcohol is added to water, boiling point of water increases.
    Reason : When a volatile solute is added to a volatile solvent elevation in boiling point is observed.

    Solution

    Elevation of boiling-point describes that the boiling point of a liquid (a solvent) will be higher when another compound is added to it, meaning that a solution has a higher boiling point than a pure solvent. 
    This happens whenever a non-volatile solute, such as a salt, is added to a pure solvent, such as water.
    When methanol is added to water, the boiling point of water decreases.
    When a more volatile solute is added to the volatile solvent vapour pressure of solvent increases due to an elevation in boiling point colligative property.

  • Question 9
    1 / -0

    Directions: This questions consist of two statements, each printed as Assertion and Reason. While answering this questions, you are required to choose any one of the following four responses.

    Assertion (A): An ideal solution obeys Henry’s law.
    Reason (R): In an ideal solution, solute-solute as well as solvent-solvent interactions are similar to solute solvent interaction.

    Solution

    An ideal solution obeys Raoult’s law.

  • Question 10
    1 / -0

    Directions: This questions consist of two statements, each printed as Assertion and Reason. While answering this questions, you are required to choose any one of the following four responses.

    Assertion : When NaCl is added to water a depression in freezing point is observed.
    Reason : The lowering of vapour pressure of a solution causes depression in the freezing point.

    Solution

    On addition of non-volatile solute (viz. NaCl) to water, NaCl solution is formed. Due to the relatively lesser number of water molecules at the surface of liquid, the solution exerts a lower vapour pressure as compared to that of pure water. It is because of this lowering of vapour pressure that a depression in the freezing point of water is observed.

  • Question 11
    1 / -0

    Directions: This questions consist of two statements, each printed as Assertion and Reason. While answering this questions, you are required to choose any one of the following four responses.

    Assertion (A): Dimethyl ether is less volatile than ethyl alcohol.
    Reason (R): Dimethyl ether has greater vapour pressure than ethyl alcohol.

    Solution

    Dimethyl ether is more volatile than ethyl alcohol.

  • Question 12
    1 / -0

    Directions: This questions consist of two statements, each printed as Assertion and Reason. While answering this questions, you are required to choose any one of the following four responses.

    Assertion : When a solution is separated from the pure solvent by a semi- permeable membrane, the solvent molecules pass through it from pure solvent side to the solution side
    Reason : Diffusion of solvent occurs from a region of high concentration solution to a region of low concentration solution.

    Solution

    Assertion and reason both are correct statements but reason is not the correct explanation of assertion.
    When a solution is separated from the pure solvent by a semipermeable membrane, the solvent molecules pass through it from pure solvent side to the solution side. Solvent molecules always flow frim lower concentration to higher concentration of solution.

  • Question 13
    1 / -0

    Directions: This questions consist of two statements, each printed as Assertion and Reason. While answering this questions, you are required to choose any one of the following four responses.

    Assertion (A): Vapour pressure increase with increase in temperature.
    Reason (R): With increase in temperature, more molecules of the liquid can go into vapour phase.

    Solution

    Vapour pressure increase with increase in temperature because more molecules of the liquid can go into vapour phase with increase in temperature.

  • Question 14
    1 / -0

    Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.

    Assertion (A): Elevation in boiling point is a colligative property.
    Reason (R): Boiling point elevation in a dilute solution is directly proportional to the molar concentration of the solute in a given solvent and is independent of the nature of the solute.

    Solution

    Elevation in boiling point is a colligative property. It is directly proportional to molarity.
    ∆Tb = Kb × m

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