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Question

The given graph in Fig represents the variation of Z (compressibility factor=pVnRT) vs.P , for the three real gases A,B and C.identify the only incorrect statement
1pbRT


A

For the gas A,a=0 and its dependence on p is linear at all pressures

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B

For the gas B,b=0 and its dependence on p is linear at all pressures.

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C

For the gas C, which is typical real gas which neither a nor b=0.By konowing the minima and the point of intersection with z=1,a and b can be calculated.

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D

At high pressure,the slope is positive for all real gases.

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Solution

The correct option is C

For the gas C, which is typical real gas which neither a nor b=0.By konowing the minima and the point of intersection with z=1,a and b can be calculated.


B relates to the incompressible volume of the molecules and measures the effective size of gas molecules.
Z=pVRT=1 for an ideal gas.

Note : options (A) , (B) and (D) are well established Eliminating the right statements,
option C is the required Answer C must be incorrect


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