Which of the following are not state functions?
(I) `q+w`
(II)`q`
(III) `w`
(IV) `H-TS`

Options

A. (i) and (iv)
B. (ii),(iii),(iv)
C. (i),(ii),(iii)
D. (ii) and (iii)

Answer

D

Explanation

According to thermodynamics,
`Delta U = q + w`
`G = H - TS`
Internal energy `(U)` and Gibbs energy `(G)` are state functions. Heat `(q)` and work `(w)` are not state functions, they are path functions.