Question

Following graph is constructed for the fixed amount of the gas.
Choose the correct option from the following:

• A. From $1-2$ pressure will increase
• B. From $2-3$ pressure remain constant
• C. Gas pressure at $3$ is greater than at state $1$
• D. From $1-2$ pressure will decrease

Answer 1

Answer: (A), (B), (C)

The correct options are
A From $1-2$ pressure will increase
B From $2-3$ pressure remain constant
C Gas pressure at $3$ is greater than at state $1$

$PV=nRT$

(A) From $1$ to $2$, the volume decreases and temperature increases. Hence, the pressure will increase. Thus, the option $A$ is correct and option $D$ is incorrect.

(B) From $2$ to $3$ the ratio of $T$ to $V$ remains constant. Hence, the pressure will remain constant. Thus the option $B$ is correct.
(C) As shown in the figure the volume at state 1 and 3 are equal than the pressure at 3 is greater than that at state 1.
Options A, B and C are correct.