Question

A flask containing 0.5 atm pressure of $A_2\left(g\right)$, some solid AB added into flask which undergoes dissociation according to $2AB\left(s\right)\rightleftharpoons A_2\left(g\right)+B_2\left(g\right)k_p=0.06at{m}^2$. The total pressure (in atm) at equilibrium is:

• A. 0.7
• B. 0.6
• C. 0.1
• D. none of these

Answer 1

The correct option is A 0.7

$\begin{array}{c}Totalpressure=2x+0.5\\ K_P=\left(0.5+x\right)\left(x\right)\\ x^2+0.5x=0.06\\ x^2+0.5x-0.06=0x=0.1and-0.6neglected\\ Totalpressure=2\times 0.1+0.5\Rightarrow 0.70\end{array}$

Option A is correct.