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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


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

  2. 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. 

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

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


Solution

The correct option is B

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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