When an ideal solution is formed?
When its components have both the above characteristics
The correct option is (C)
(C) When its components have both the above characteristics
So, this is the correct option.
(A) When its components have no volume change on mixing
The ideal solution not only follows this condition but also some other conditions are there. So, this is an incorrect answer.
(B) When its components have no enthalpy change on mixing
The ideal solution not only follows this condition but also some other conditions are there. So, this is an incorrect answer.
(D) When its components have high solubility.
This is not a condition for forming the ideal solution. So, this is an incorrect option.
Hence. The correct option is (C).