Q109 · CSIR NET Chemistry, December 2014
Paper: CSIR NET December 2014 · Subject: Physical Chemistry · Chapter: Thermodynamics · Topic: Laws State Functions · Marks: 2 · Difficulty: Easy
The exact differential df of a state function $\mathrm{f}(\mathrm{x}, \mathrm{y})$, among the following is
(a)$x d y$
(b)$\mathrm{dx}-\frac{\mathrm{x}}{\mathrm{y}} \mathrm{dy}$
(c)$\mathrm{ydx}-\mathrm{xdy}$
(d)$\frac{1}{\mathrm{y}} \mathrm{dx}-\frac{\mathrm{x}}{\mathrm{y}^{2}} \mathrm{dy}$
Answer
Answer: D ✓ checked by 4AB · confidence high
Explanation
d(x/y) = dx/y − (x/y²)dy is exact (d).
Study loop for Thermodynamics