$1]$

$x$ axis title is:

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The area of enclosed path represent :

$2]$ The Helmholtz functions remains constant for reversible

$1$d

$-$processes

$3]$ The process is as change in enthalpy is positive.

$4]$ The more effective ways of increasing efficiency of Carnot engine are

and

$5]$ The total translational kinetic energy for gases depends ol

nd