If the various terms in the following expressions have usual meanings, the van't Hoff factor 'i' cannot be calculated by which of the following expression ?

Options

A. `piV=sqrt(i)nRT`
B. `DeltaT_(f)=ik_(f).m`
C. `DeltaT_(b)=ik_(b).m`
D. `(""^(o)P_("solvent")-P_("solution"))/(""^(o)P_("solvent"))=i((n)/(N+n))`

Answer

A

Explanation

(a) Van’t Hoff equation is
`piV="inRT"`
(b) For depression in freezing point.
`DeltaT_(f)=ixxk_(f)xxm`
(c) For elevation in boiling point.
`DeltaT_(b)=ixxk_(b)xxm`
(d) For lowering of vapour pressure,
`(P_("solvent")-P_("solution"))/(P_("solvent"))=i((n)/(N+n))`.