Question

2
AIIMS 2013
Which thermodynamic parameter does not depend
only on initial and final state ?
(1) q at constant pressure
(2) q at constant volume
(3) w at adiabatic
(4) w at isothermal​

Answer 1

Answer:

W and q are not state functions

H and U are state functions

ΔH=ΔU+ΔPV

At constant pressure, ΔH=ΔU+PΔV ΔP=0 ΔH=q

p

At constant volume, ΔH=ΔU+VΔP ΔV=0 ΔU=q

v

So, the first two options are state function.

ΔU=q−W (∵q=0) [∴ Adialentic process]

ΔU=−W (state function)

Work done in isotheromal process is not a state

function

W=−q(∵ΔT=0,q



=0)

∴ option D is correct.