The correct statement regarding Joule – Thomson effect is ____?

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Let T1,T2 are temperature of gas before and after expansion respectively, if T1>T2 then cooling effect or positive Joule Thomson effect and also if T1

Pressure dependence of temperature during expansion is given by Joule-Thomson coefficient i.e. ∂T∂PH

Ideal gas will show neither heating nor cooling during Joule Thomson effect

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answer is D.

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Detailed Solution

When a real gas is allowed to undergo unrestricted expansion adiabatically, it undergoes cooling except for He and hydrogen. This is called positive Joule-Thompson effect due to the presence of intermolecular forces. This fact find its use in liquefaction of gases.∂T∂PH>0; for most gasesHe and hydrogen experiences heating. This is called negative Joule-Thompson effect∂T∂PH<0; for H2 and HeFor ideal gas,∂T∂PH=0So they do not experience either cooling or heating.

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