A mixture of and in the molar ratio is diffused through a pin hole for successive effusions three times to give a molar ratio of diffused mixture. Which of the following are not correct if diffusion is made at same and in each operation? 

a) 
Eight operations are needed to get molar ratio 
b) 
Rate of diffusion for after 8 operations is 
c) 
Six operations are needed to get molar ratio for and in diffusion mixture 
d) 
Rate of diffusion for and after 6 operations is 
A mixture of and in the molar ratio is diffused through a pin hole for successive effusions three times to give a molar ratio of diffused mixture. Which of the following are not correct if diffusion is made at same and in each operation? 

a) 
Eight operations are needed to get molar ratio 
b) 
Rate of diffusion for after 8 operations is 
c) 
Six operations are needed to get molar ratio for and in diffusion mixture 
d) 
Rate of diffusion for and after 6 operations is 
Eight operations are needed to get molar ratio 
Rate of diffusion for after 8 operations is 
Six operations are needed to get molar ratio for and in diffusion mixture 
Which of the following statements is/are true? 

a) 
Hydrogen diffuses four times faster than oxygen 
b) 
The temperature of a real gas changes when it expands adiabatically in vacuum 
c) 
An ideal gas undergoes cooling effect when it suffers an adiabatic expansion in vacuum 
d) 
The JouleThomson coefficient of an ideal gas is zero 
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