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1)During adiabatic process Delta u = W (...

1)During adiabatic process `Delta u = W _(ad)`
2) W = 0 for isothermal expansion of ideal gas into vacuum
3) For isothermal irreversible change from `V_(1)` to `V_(2)` , `Q = -W = P_(ext) (V_(2)-V_(1))`
4) `Q_(P)` is a state property
Which of these statements are correct

A

`1,2,3`

B

`1, 3, 4`

C

All

D

`1,2,4`

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