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Poonam Chand Sagar
Asked: 2022-11-04T18:40:29+05:30 In:

Positive deviation from ideal behaviour takes place because of
A. finite size of atoms and `pV//nRT lt 1`
B. molecular interaction between atoms and `pV//nRT gt 1`
C. finite size of atoms and `pV//nRT gt 1`
D. molecular interaction between atoms and `pV//nRT lt 1`

Positive deviation from ideal behaviour takes place because of
A. finite size of atoms and `pV//nRT lt 1`
B. molecular interaction between atoms and `pV//nRT gt 1`
C. finite size of atoms and `pV//nRT gt 1`
D. molecular interaction between atoms and `pV//nRT lt 1`
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  1. Correct Answer – C
    According to the van der Waals equation , we have
    `(p + (an^(2))/(V^(2))) (V – nb) = nRT`
    When molecular interaction (i.e., attraction ) is insignificant , then the `an^(2)//V^(2)` may be neglaected relative to `p` to give
    `p(V – nb) = RT`
    or `pV – npb = nRT`
    or `pV = nRT + npb`
    Dividing both sides by `nRT` , we have
    `(pV)/(nRT) = 1 + npb`
    Thus , `pV//nRT gt 1`
    This happens whenn the factor `b` which measures the size of particles is significiant.

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