question_answer

In a reaction\[A+B~\rightleftharpoons C+D\], the initial concentrations, of A and B were 0.9 mol. \[d{{m}^{-3}}\]each. At equilibrium the concentration of D was found to be 0.6 mol \[d{{m}^{-3}}\]. What is the value of equilibrium constant for the reaction

A) 8                     

B) 4  

C) 9                                 

D) 3

Correct Answer: B

Solution :

[a] Initial At eqm. \[{{K}_{c}}=\frac{0.6\times 0.6}{0.3\times 0.3}=4\]