Question

The correct order of True/False of the following statement is:

$S_1$: Rate of diffusion and effusion of a gas increases by increasing the pressure and decreasing the temperature.

$S_2$: An ideal gas has van der Waal's constant a and b equal to zero.

$S_3$: If an ideal gas in expanded adiabatically against a constant pressure, then $T{V}^{\gamma -1}=$constant.

• A. TTF
• B. FFT
• C. TTT
• D. FFF

Answer 1

The correct option is A TTF

1. Rate of diffusion $\alpha \frac{P}{\sqrt{TM}}A$
where P is Pressure, A is Area of the hole, T is Temperature and M is Molecular weight. So, statement 1 is true.

2. For ideal gas, $PV=nRT[a=0,b=0]$. So, statement 2 is true.

3. The process is irreversible adiabatic. $\therefore P{V}^{\gamma -1}\ne constant$ So, statement 3 is false.

Option A is correct.