Isotonic solutions are those which have

Options

A. same vapour pressure
B. same concentration
C. same density
D. same osmotic pressure

Answer

C

Explanation

If `p^(@)=100mm, p_(s)=100-10=90mm`
`(p^(@)-p_(s))/(p^(@))=(w_(2)//M_(2))/(w_(1)//M_(1))=(w_(2))/(M_(2))xx(M_(1))/(w_(1))`
`(100-90)/(100)=(w_(2))/(60)xx(18)/(180)`
or `w_(2)=(10)/(100)xx60xx10=60g`