question_answer

\[{{K}_{c}}\] for the following reaction is This reaction is set-up in aqueous medium. \[1\text{ }mol\]of \[{{I}_{2}}\] and \[0.5\text{ }mol\text{ }{{I}^{\bigcirc -}}\]in 1 L flask, after equilibrium is reached, excess of \[AgN{{O}_{3}}\]gave \[0.25\text{ }mol\]of yellow precipitate.

A) \[1.33\]                   

B)        \[2.66\]                  

C) \[2.00\]                  

D)        \[3.00\]

Correct Answer: A

Solution :

[a] Excess \[AgN{{O}_{3}}\] gave \[0.25\text{ }mol\]of yellow precipitate. \[\Rightarrow \,\,\,\,\,\,0.5-x=0.25\] \[\Rightarrow \,\,\,\,\,\,x=0.25\] \[=\frac{0.25/1}{\left( \frac{0.75}{1} \right)\left( \frac{0.25}{1} \right)}=1.33\,(V=1.0L)\]