MCQ
At a certain temperature, only $50\%$ $HI$ is dissociated into $H_2$ and $I_2$ at equilibrium. The equilibrium constant is
- ✓$0.25$
- B$3$
- C$0.5$
- D$1$
✓
Answer
Correct option: A.
$0.25$
a
$\begin{array}{l}2 HI \quad\quad\rightleftharpoons\quad H _2\quad+\quad I _2 \\ a\quad\quad\quad\quad\quad\quad0\quad\quad\quad\quad0 \\ a (1-0.5) \quad\quad0.25 a \quad\quad0.25 a \end{array}$
$\begin{array}{l}2 HI \quad\quad\rightleftharpoons\quad H _2\quad+\quad I _2 \\ a\quad\quad\quad\quad\quad\quad0\quad\quad\quad\quad0 \\ a (1-0.5) \quad\quad0.25 a \quad\quad0.25 a \end{array}$
$K =\frac{(0.25 a )(0.25 a )}{(0.5 a )^2}$
$K =0.25$
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