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Liquids show viscosity which is due to ...

Liquids show viscosity which is due to
X) Creation of friction between the layers of the fluid.
Y) Inter molecular attraction forces of the liquid.
Z) Inter molecular repulsion forces of the liquid.

A

Y,Z

B

X,Y

C

X,Z

D

X,Y,Z

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question regarding the causes of viscosity in liquids, we can analyze the options provided: ### Step-by-Step Solution: 1. **Understanding Viscosity**: - Viscosity is defined as the measure of a liquid's resistance to flow. It describes how thick or thin a liquid is. For example, honey has a higher viscosity than water. **Hint**: Remember that viscosity relates to how easily a liquid flows. 2. **Analyzing Option X**: - Option X states that viscosity is due to the creation of friction between the layers of the fluid. - When a liquid flows, it does so in layers. The movement of one layer relative to another creates friction, which resists the flow. Hence, this statement is correct. **Hint**: Think about how layers of liquid interact when they move past each other. 3. **Analyzing Option Y**: - Option Y mentions that viscosity is due to intermolecular attraction forces of the liquid. - Intermolecular forces between the molecules in the liquid contribute to its viscosity. Stronger intermolecular forces mean greater resistance to flow, making this statement also correct. **Hint**: Consider how the forces between molecules affect their ability to move freely. 4. **Analyzing Option Z**: - Option Z states that viscosity is due to intermolecular repulsion forces of the liquid. - While intermolecular forces do exist, repulsion does not contribute to viscosity. Instead, it is the attraction that plays a significant role. Therefore, this statement is incorrect. **Hint**: Focus on the role of attraction versus repulsion in molecular interactions. 5. **Conclusion**: - Based on the analysis, options X and Y are correct regarding the causes of viscosity in liquids. Therefore, the correct answer is that viscosity is due to both the creation of friction between the layers of the fluid (X) and the intermolecular attraction forces of the liquid (Y). ### Final Answer: The correct options are X and Y.
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Which characterises the weak intermolecular forces of attraction in a liquid?

When a liquid flows in a tube, there is relative motion between adjacent layers of the liquid. This force is called the viscous force which tends to oppose the relative motion between the layers of the liquid. Newton was the first person to study the factors that govern the viscous force in a liquid. According to Newton’s law of viscous flow, the magnitude of the viscous force on a certain layer of a liquid is given by F = - eta A (dv)/(dx) where A is the area of the layer (dv)/(dx) is the velocity gradient at the layer and eta is the coefficient of viscosity of the liquid. The dimensional formula for the coefficient of viscosity is :

Knowledge Check

  • The inter-particle force of attraction between the particles is maximum in

    A
    gases
    B
    liquids
    C
    solids
    D
    matter

  • Assertion :when fluid flows, there is some loss of energy due to friction. Reason : Different layers of the fluid exert forces on each other .

    A
    If both assertion and reason are true and reason is the correct explanation of assertion.
    B
    If both assertion and reason are true but reason is not the correct explanation of assertion.
    C
    If assertion is true and reason is false.
    D
    If both assertion and reason are false.

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    When a liquid flows in a tube, there is relative motion between adjacent layers of the liquid. This force is called the viscous force which tends to oppose the relative motion between the layers of the liquid. Newton was the first person to study the factors that govern the viscous force in a liquid. According to Newton’s law of viscous flow, the magnitude of the viscous force on a certain layer of a liquid is given by F = - eta A (dv)/(dx) where A is the area of the layer (dv)/(dx) is the velocity gradient at the layer and eta is the coefficient of viscosity of the liquid. If f is the frictional force between a solid sliding over another solid, and F is the viscous force when a liquid layer slides over another, then :

    When a liquid flows in a tube, there is relative motion between adjacent layers of the liquid. This force is called the viscous force which tends to oppose the relative motion between the layers of the liquid. Newton was the first person to study the factors that govern the viscous force in a liquid. According to Newton’s law of viscous flow, the magnitude of the viscous force on a certain layer of a liquid is given by F = - eta A (dv)/(dx) where A is the area of the layer (dv)/(dx) is the velocity gradient at the layer and eta is the coefficient of viscosity of the liquid. A river is 5 m deep. The velocity of water on its surface is 2 ms^(-1) If the coefficient of viscosity of water is 10 ^(-3 ) Nsm ^(-2) , the viscous force per unit area is :

    What happens to the intermolecular force of attraction between the molecules in a change of state from solid to liquid?

    The weakest inter molecular forces are present in:

    Viscosity of a liquid arises due to strong intermolecular forces existing between the molecules. Stronger the intermolecular forces, greater is the viscosity. Name the intermolecular forces existing in the following liquids and arrange them in the increasing order of their viscosities. Also give reason for the assigned order in one line. water, hexane (CH_(3)CH_(2)CH_(2)CH_(2)CH_(2)CH_(3)) , glycernine (CH_(2)OHCH(OH)CH_(2)OH)

    (A) : Chlorine is gas, bromine is liquid and iodine is solid (R) : Intermolecular attraction forces increase upon increase in molecular masses .

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