Thermodynamic Potential MCQ Level – 2 - Physics MCQ

From Claussius-Clapeyron eauation

on boiling V₂ > V₁

Hence if we raise pressure above 1 atm the boiling point will also increase and will be higher than 373 K.
The correct answer is: Higher than 373 K

Sublimation curve connects points at which vapour and solid exists in equilibrium.
The correct answer is: Sublimation curve

From Maxwell’s equations

The correct answer is:  

F = –kT ln Z



= k[ln Z – βE]
The correct answer is: S = k[ln(Z) – βE]

F = U – TS
⇒ dF = dU – TdS – SdT
dF = –pdV – SdT ...(1)
take V constant

take T constant

The correct answer is:  

Critical point is that point on vapourization curve at which liquid and vapour phase have same density and above this temperature, a gas cannot be liquified by increasing the pressure.
The correct answer is: Above critical point, a gas cannot be liquified

F = U – TS

differentiating w.r.t. ‘T’

keeping V constant, dW = 0
⇒dU = dQ

The correct answer is: 

Internal energy 
 Energy of the system in the ith state the partition function




Thus, 

The correct answer is: 

The correct answer is: 

As we go to a higher altitude, the pressure decreases and from ClaussiusClapeyron equation

Since dp is negative dT has to be negative hence boiling point decreases.
The correct answer is: Pressure decreases