Q30 of 55 Page 56

Name two intermolecular forces that exist between HF molecules in liquid state.

H-bonding: strong H- bonding present between the HF molecules due to high polarity of H-F bond.



Dipole- dipole interaction:


These interactions occur when two dipolar molecules interact with each other via space. In this, partially negative portion of one polar molecule is attracted to partially positive portion of second polar molecule.



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Pressure exerted by saturated water vapour is called aqueous tension. What correction term will you apply to the total pressure to obtain pressure of dry gas?

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Name the energy which arises due to motion of atoms or molecules in a body. How is this energy affected when the temperature is increased?

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One of the assumptions of kinetic theory of gases is that there is no force of attraction between the molecules of a gas. State and explain the evidence that shows that the assumption is not applicable for real gases.

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Compressibility factor, Z, of a gas is given as Z = PV/ nRT

(i) What is the value of Z for an ideal gas?


(ii) For real gas what will be the effect on value of Z above Boyle’s temperature?