$K_p$ for the reaction $A \rightleftharpoons B$ is 4 . If initially only $A$ is present then what will be the partial pressure of $B$ after equilibrium?

• A

  $1.2$
• Correct answer
  B

  $0.8$
• C

  $0.6$
• D

  $1$

Solution

Assumingthatreaction isstarted with $1 \mathrm{~mol}$ of $A$ and at equilibrium $x$ moles of $A$ have reacted,

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