| Assertion: The osmotic pressure of a solution obtained by mixing 100 mL of 3.4% solution of urea and 100 mL of 1.6% solution of cane sugar at 293 K is 7.46 bar. |
| Reason: The total osmotic pressure will be equal to the sum of partial osmotic pressures. |
A) Assertion and reason both are correct statements and reason is correct explanation for assertion.
B) Assertion and reason both are correct statements but reason is not correct explanation for assertion.
C) Assertion is correct statement but reason is wrong statement.
D) Assertion is wrong statement but reason is correct statement.
Correct Answer: A
Solution :
Osmotic pressure of urea \[{{W}_{B}}=3.4\,\,g\], \[V=200\text{ }mL=0.2\text{ }L,T=293K\] \[{{M}_{B}}=\,\,60\], \[R\text{ }=\text{ }0.083\text{ }L\text{ }bar\text{ }mo{{l}^{-1}}{{K}^{-1}}\] \[\pi =\frac{{{w}_{B}}RT}{{{M}_{B}}V}=\frac{3.4\times 0.083\times 293}{60\times 0.2}=6.89\]bar Osmotic pressure of cane sugar \[\pi =\frac{{{w}_{B}}RT}{{{M}_{B}}V}=\frac{1.6\times 0.083\times 293}{342\times 0.2}=0.57\]bar \[\pi =6.89+0.57=7.46\text{ }bar\]
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