Question

Which of the following is not correct for an ideal solution?

• A. Raoult's law is obeyed for entire concentration range and temperatures
• B. $△H_{mix}=0$
• C. $△V_{mix}=0$
• D. $△S_{mix}=0$

Answer 1

Answer: (D)

$△S_{mix}=0$

For an ideal solution,

• Raoult's law is obeyed for entire concentration range and temperatures
• The enthalpy change of mixing is zero $△H_{mix}=0.$
• The volume of mixing is zero. \triangle $V_{mix}=0$
• But the entropy of mixing is not equal to zero. $△S_{mix}\ne 0$​

Option D is correct.