Which solution is isotonic with 6% W/V aqueous solution of urea? [Mole mass of Urea =` 60 gm. "Mol"^(-1)`]

Options

A. 0.25 M NaCl
B. 0.5 M NaCl
C. 0.1 M NaCl
D. 1 M NaCl

Answer

B

Explanation

For isotonic sol
`pi_(1)= pi_(2)`
`i_(1) c_(1)= i_(2)c_(2)`
`1[(6 xx 1000)/(60 xx 100)]= 2[M]`
`= M= 0.5`
`0.5 M NaCl`