Question

Other than the X $-$ ray diffractions, how could be the following pairs of isomers be distinguished from one another by $\left[Cr{\left(N{H}_3\right)}_6\right]\left[Cr{\left(N{O}_2\right)}_6\right]$ and $\left[Cr{\left(N{o}_2\right)}_2{\left(N{H}_3\right)}_4\right]\left[Cr{\left(N{O}_2\right)}_4{\left(N{H}_3\right)}_2\right]$?

• A. electrolysis of an aqueous solution
• B. measurement of molar conductance
• C. measuring magnetic moments
• D. observing their colours

Answer 1

The correct option is B measurement of molar conductance

${\left[Cr{\left(N{H}_3\right)}_6\right]}^{+3}{\left[Cr{\left(N{O}_2\right)}_6\right]}^{-3}$ and ${\left[Cr{\left(N{o}_2\right)}_2{\left(N{H}_3\right)}_4\right]}^{+}{\left[Cr{\left(N{O}_2\right)}_4{\left(N{H}_3\right)}_2\right]}^{-}$
As on ionisation they will give different complexes with different charge so they will have different molar conductance so by measurement of molar conductance, we can differentiate between them.