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. `pi V = sqrt("in")RT`
B. `Delta T_(f)=ik_(f).m`
C. `Delta T_(b)=ik_(b).m`
D. `(.^(@)P_("solvent")-P_("solution"))/(.^(@)P_("solvent"))=i((n)/(N+n))`

Answer

A

Explanation

(a) Vant' Hoff equation is
`piV` = inRT
(b) For depression in freezing point.
`Delta T_(f)=ixx k_(f)xx m`
(c ) For elevation in boiling point.
`Delta T_(b)= ixx k_(b)xx m`
(d) For lowering of vapour pressure,
`(P_("solvent")-P_("solution"))/(P_("solvent"))=i((n)/(N+n))`.