Solution A contains 7 g/L of `MgCl_(2)` and solution B contains 7 g/L of NaCl. At room temperature, the osmotic pressure of :

Options

A. solution A is greater than B
B. both have same osmotic pressure
C. solution B is greater than A
D. can't determine.

Answer

C

Explanation

`7gL^(-1)MgCl_(2)=(7)/(24+71)"mol L"^(-1)`
`=(7)/(95)" mol L"^(-1)=(7xx3)/(95)"mol L"^(-1) " of ions "=0.22M`
`7gL^(-1)NaCl=(7)/(23+35.5)M`
`=(7)/(58.5)M=(7xx2)/(58.5)"mol L"^(-1)" of ions = 0.24 M"`
As concentration of ions in NaCl solution is greater, NaCl soltuion (solution B) will have greater osmotic pressure.