Liquid Solution

A sample of water is found to contain \(5.85 \%\) \(\left(\frac{w}{w}\right)\) of \(A B\) (molecular mass 58.5 ) and \(9.50 \%\) \(\left(\frac{w}{w}\right) X Y_2\) (molecular mass 95). Assuming \(80 \%\) ionisation of \(A B\) and \(60 \%\) ionisation of \(X Y_2\), the freezing point of water sample is [Given, \(K_f\) for water \(1.86 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1}\), Freezing point of pure water is \(273 \mathrm{~K}\) and \(A, B\) and \(Y\) are monovalent ions.]