An aqueous solution of a solute AB has b.p. of `101.08^(@)C( AB` is `100%` ionised at boiling point of the solution ) and freezes at `-1.80 ^(@)C`. Hence, `AB(K_(b)//K_(f)=0.3)`

Options

A. is `100%` ionised at the `f.p.` of the solution
B. behaves as non`-` electrolyte at the `f.p.` of the solution
C. forms dimer
D. none of the above

Answer

2

Explanation

Given `DeltaT_(b)=1.08^(@)C," "I=2` at boiling pt. of solution.
and `DeltaT_(f)=1.80^(@)C,` and `(k_(b))/(k_(f))=0.3`
so`" "(DeltaT_(b))/(DeltaT_(f))=(I_(b)k_(b)m)/(I_(f)k_(f)m)`
so`" "I_(f)=1`
`i.e.,AB` behaves as non-electrolyte at the f.p. of the solution.