Question

Which curve in Fig. $5.2$ represents the curve of ideal gas?

• A. $C$ and $D$ only
• B. $A$ and $B$ only
• C. $E$ and $F$ only
• D. $B$ only

Answer 1

The correct option is D $B$ only

$\text{Ideal gas equation}$

A gas that obeys gas laws and equation of state $(PV=nRT)$ at all conditions of temperatures and pressures is called an ideal gas. Now, from ideal gas equation:

$PV=nRT$

Where, $P=$ Pressure of the gas

$V=$ Volume of the gas
$n=$ Number of moles of gas
$R=$ Universal gas constant
$T=$ Temperature of the gas

At constant $T$ and $n$;

$PV=$ Constant for all pressures

($PV$ will not change with the pressure)


We know that $PV$ is constant at all temperatures for an ideal gas, hence curve ${}^{\prime }{B}^{\prime }$ is the curve for an ideal gas since it is a straight line indicating that $PV$ remains constant.