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Liquid Test - 3
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Liquid Test - 3
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  • Question 1/10
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     Boiling does not occur when:

    Solutions

    Because in a closed vessel the amount of liquid is constant i.e the water which is converted into vapour again condenses to form water and boiling occurs when vapour pressure is equal to atmospheric pressure since it is closed so they couldn't be equal.

  • Question 2/10
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    The liquids boil at lower temperature at high altitude because:

    Solutions

    At higher altitudes, air pressure is lower. When atmospheric pressure is lower, such as at a higher altitude, it takes less energy to bring water to the boiling point. Less energy means less heat, which means water will boil at a lower temperature at a higher altitude.

  • Question 3/10
    1 / -0

    The vapour pressure of a liquid depends upon:

    Solutions

    Vapor pressure is an intensive property, since it only depends on the fraction of the surface particles that can vaporize.

  • Question 4/10
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     A liquid enclosed in 1.0L flask at 298K. The vapour pressure exerted by the liquid is 20.0 mm. when the same liquid is enclosed in a flask of 5L capacity at the same temperature, the vapour pressure of the liquid will be:

    Solutions

     

    The vapour pressure of a liquid depends only on the nature of the liquid and the temperature. It does not depend on the volume of the container so it is 20.0mm.

  • Question 5/10
    1 / -0

     On increasing the temperature of water, the surface tension of water:

    Solutions

    SURFACE TENSION:
    Surface Tension is a property of liquid at rest by virtue of which a liquid surface gets contracted to a minimum area and behaves like a stretched membrane.
    An increase in temperature of water (or any liquid) leads to an increase in kinetic energy of molecules. Thus, intermolecular forces among molecules are lowered and a decrease in surface tension is noticed.

  • Question 6/10
    1 / -0

     The phenomenon responsible for spherical shape of liquid drops is:

    Solutions

    The cohesive forces between liquid molecules is responsible for the surface tension. The molecules of water on the surface don't have like molecules around it.So the water droplets tend to be pulled into shape of spherical due to cohesive forces.Thats why, the drop of water is always spherical.

  • Question 7/10
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    The S.I unit of viscosity is:

    Solutions

    This is the SI unit of viscosity, equivalent to newton-second per square metre (N. s m-2). It is sometimes referred to as the poiseuille (symbol Pl). One poise is exactly 0.1 Pa

  • Question 8/10
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    Vapour density of a diatomic elementary gas is 16. The atomic mass of gas is:

    Solutions

    Vapour density is equal to molecular mass by 2 therefore the molecular mass of the gas will be 32 so we have a diatomic elementary gas so atomic mass will be molecular mass divided by two of the atomic mass of the gas will be 16.

  • Question 9/10
    1 / -0

     Greater the viscosity, the:

    Solutions

    Viscosity is the measure of resistance of a fluid to flow. A fluid that is highly viscous has a high resistance (like having more friction) and flows slower than a low-viscosity fluid. As Honey would move slower than water, so honey would have a greater viscosity.

  • Question 10/10
    1 / -0

     Vapour pressure of a liquid decreases with increase in:

    Solutions

    The vapor pressure of a liquid is the equilibrium pressure of vapor above the liquid at a given temperature. Thus, all else (molar mass, for example) equal, a polar molecule will generally have a lower vapor pressure than a non-polar molecule.

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