Two containers $C_{1}$ and $C_{2}$ of volumes $V$ and $4V$ respectively,hold the same ideal gas and are connected by a thin horizontal tube of negligible volume with a valve which is initially closed. The initial pressures of the gas in $C_{1}$ and $C_{2}$ are $p$ and $5p$,respectively. Heat baths are employed to maintain the temperatures in the containers at $300 \, K$ and $400 \, K$,respectively. The valve is now opened. Select the correct statement.

• A
  The gas will flow from the hot container to the cold one and the process is reversible.
• B
  The gas will flow from one container to the other till the number of moles in two containers are equal.
• C
  $A$ long time after the valve is opened,the pressure in both the containers will be $3p$.
• D
  $A$ long time after the valve is opened,the number of moles of gas in the hot container will be thrice that of the cold one.