A $20 \mathrm{litre}$ container at$400 \mathrm{K}$ contains ${\mathrm{CO}}_2\left(\mathrm{g}\right)$ at pressure $0.4 \mathrm{atm}$ and an excess of $\mathrm{SrO}$ (neglect the volume of solid $\mathrm{SrO}$ ). The volume of the container is now decreased by moving the movable piston fitted in the container. The maximum volume of the container, when the pressure of ${\mathrm{CO}}_2$ attains its maximum value, will be:

$\left(\mathrm{Given}\mathrm{ }\mathrm{that}:{\mathrm{SrCO}}_3\left(\mathrm{s}\right)\rightleftharpoons \mathrm{SrO}\left(\mathrm{s}\right)+{\mathrm{CO}}_2\left(\mathrm{g}\right),\mathrm{ }{\mathrm{K}}_{\mathrm{p}}=1.6\mathrm{ }\mathrm{atm}\right)$

• Correct answer
  A

  $5 \mathrm{litre}$
• B

  $10 \mathrm{litre}$
• C

  $4 \mathrm{litre}$
• D

  $2 \mathrm{litre}$

Hence, the correct answer is option: 'A'.