Identify the correct statement:

Options

A. `0.1 M NaCl` and `0.1 M` glucose solution are isotonic
B. `0.1 M NaCl` and `0.3 M` glucose solution are isotonic
C. The boiling point of `0.1 m` aqueous urea solution is less the `0.1 m` aqueous KCl solution
D. The freezing point of `0.1 m` glucose solution is less than `0.1 m KCl` solution.

Answer

C

Explanation

`pi_(NaCl) = i xx CRT " " pi_(glr cos e) = 1 xx 0.1 xx RT`
`= 2 xx 0.1RT " " = 0.1 RT`
`= 0.2 RT " " pi_(NaCL) != pi_(glu cos e)`
`DeltaT_(b(NaCl)) = 2 xx 0.1K_(f) " " DeltaT_(b(urea)) = 0.1 K_(f)`
Hence `DeltaT_(b(urea)) lt Delta T_(b(NaCl))`
`Delta T_(f(glucos e)) = 0.1 xx K_(f) " " Delta T_(f(KCl)) = 2 xx 0.1 xx K_(f)`
`Delta T_(f) = 0.2 K_(f)`
`T_(f(glucos e)) gt T_(f(KCl))`