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If the plot of density $\rho$ versus temperature $T$ is as given below, identify which of the following statements is incorrect?

(A) Pressure at B is lower than Pressure at A (B) Work done by gas is negative during the process (C) Product of P & V at A and B are equal (D) Change in internal energy from A to B is zero.

1 Answer

For an ideal gas, $\rho = \large\frac{PM}{RT}$.
Here, $T$ is a constant which imples that Pressure must be increasing so as to increase $\rho$.
Therefore Option "(A) Pressure at B is lower than Pressure at A" is incorrect.
Since $P$ is increasing, $V$ decreases, which implies work done is negative.
Since $T$ is constant, $PV = $ constant and also $\Delta u = 0$.
answered Mar 11, 2014 by balaji.thirumalai

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