100 cc of 1.5% solution of urea is found to have an osmotic pressure of 6.0 atm and 100 cc of 3.42% solution of cane sugar is found to have an osmotic pressure of 2.4 atm. If two solutions are mixed, the osmotic pressure of the resulting solution will be

Options

A. 8.4 atm
B. 4.2 atm
C. 16.8 atm
D. 2.1 atm.

Answer

B

Explanation

On mixing , the concentrations are reduced to half of the original values. So osmotic pressures also become half
`i.e., P_("urea") = 3.0 "atm"``P_("cane sugar")` = `1.2 "atm"`
Total = 4.2 atm.