The correct statement amongst the following is:

1.	The correct statement amongst the following is:
Answer» For every gas there exists a characteristic TEMPERATURE above which it cannot be liquefied no matter however high is the pressure applied called CRITICAL temperature of the gas. For every gas there exists a characteristic temperature at which its compressibility factor is equal to unity for some range of pressure. Amongst `He, N_2, O_2 and CO_2,CO_2` has the lowest value of "a" and He has the lowest value "b" where a and BARE VANDER walls constants of the gas. The extent of departure of Z (compressibility factor) from unity is the measure of the extent of deviation from ideal behavior. SOLUTION :a) `T_c "" ` b) `T_b` c) `CO_2` has highest value of aa d) Z gives measure of deviation.

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