Which among the following is not an exact differential?

Q

(

d Q =

heat absorbed)

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U

(

d U =

change in internal energy)

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S

(

d S =

Entropy change)

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G

(

d G =

Gibbs free energy change)

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Solution

The correct option is A $Q$ ( $d Q =$ heat absorbed)
$d Q$ (heat absorbed) is inexact differential. Because it depends on the path followed hence not exact differentials
$ϕ d Q \neq 0$ $-$ not differential

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Which among the following is not an exact differential?

The correct option is A Q (dQ= heat absorbed)dQ (heat absorbed) is inexact differential. Because it depends on the path followed hence not exact differentials ϕdQ≠0 − not differential

The correct option is A $Q$ ( $d Q =$ heat absorbed)
$d Q$ (heat absorbed) is inexact differential. Because it depends on the path followed hence not exact differentials
$ϕ d Q \neq 0$ $-$ not differential