Question

An ideal gas goes from the state i to the state f as shown in figure. The work done by the gas during the process
(a) is positive
(b) is negative
(c) is zero
(d) cannot be obtained from this information.

Answer 1

(c) is zero

Work done by the gas during the process, $∆W=P∆V$
Here,
P = Pressure
$∆$V = change in volume.

Since the process described in the figure is isochoric, P = kT. As volume remains constant ($∆$V = 0), $∆$W = 0.