At $27^{\circ} \mathrm{C}, 1 \mathrm{~L}$ of $\mathrm{H}_2$ with a pressure of 1 bar is mixed with 2 L of $\mathrm{O}_2$ with a pressure of 2 bar in a 10 L flask. What is the pressure exerted by gaseous mixture in bar ? (Assume $\mathrm{H}_2$ and $\mathrm{O}_2$ as ideal gases)

• A

  $4$
• B

  $0.05$
• C

  $1$
• Correct answer
  D

  $0.5$

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