Question

A compound X undergoes tetramerisation in a given organic solvent. The vant Hoff factor is

• A. $ {{\text{V}}_{\text{final}}}\text{=4}{{\text{V}}_{\text{intial}}} $
• B. $ {{V}_{final}}=6{{V}_{\operatorname{int}ial}} $
• C. $ Ca{{F}_{2}}({{K}_{sp}}=1.7\times {{10}^{-10}}) $
• D. $ {{10}^{-4}}\,M\,C{{a}^{2+}}+{{10}^{-4}}M{{F}^{-}} $

Answer 1

Answer: (B)

$ \underset{1-\alpha }{\mathop{4A}}\,\underset{\frac{\alpha }{4}}{\mathop{{{(A)}_{4}}}}\, $ $ i=\frac{1-\alpha +\frac{\alpha }{4}}{1}=1-\frac{3}{4}\alpha $ $ \alpha $ = degree of association $ =1=100% $ $ \therefore $ $ i=1-\frac{3}{4}=0.25 $