A `5%` solution of cane sugar (molecular weight=342) is isotonic with `1%` solution of substance `X`.The molecular weight of `X` is

Options

A. 34.2
B. 171.2
C. 68.4
D. 136.8

Answer

C

Explanation

Isotonic solution has same O.P. under same conditions hence concentration of the two solution must be same.
`C_(1) = C_(2)`
`(5)/( 0.1 xx342 ) = (1)/( 0.1xx x)`