The correct order of increasing boiling points of the following aqueous solutions
`0.0001MNaCl(I)," 0.0001M Urea (II) ", 0.001MMgCl_(2)(III)," 0.01MNaCl(IV) is"`

Options

A. I lt II lt III lt IV
B. IV lt III lt II lt I
C. II lt I lt III lt IV
D. III lt II lt IV lt I

Answer

C

Explanation

`DeltaT=ixxk_(b)xxm`
`ixxm` of (0.01M)NaCl is highest, hence its boiling point will also increase the maximum.
0.01 M NaCl, `ixxm=2xx0.01=0.02`
0.001 M `MgCl_(2),ixxm=3xx0.001=0.003`
`0.0001MNaCl,ixxm=2xx0.0001=0.0002`
`0.0001M` urea, `ixxm=1xx0.0001=0.0001`.