How do we know that the solution given in the question is an ideal one ?

will it be given in tghe question paper ?

please help soon

thank you.

Yes . It should be always mentioned in question paper directly. Otherwise you can also check the given parameters.
Here i am explaining you again ideal and non-ideal solution and its parameters.

Ideal Solution

Solutions which obey Raoults law over the entire range of concentrations

For ideal solution:

Enthalpy of mixing and volume of the pure components to form the solution,

ΔH _mix = 0

Δ V _mix = 0

An ideal solution will be formed when intermolecular forces of attraction between the molecules of solute (A- A) and those between the molecules of solvent (B- B) are nearly equal to those between solute and solvent molecules (A- B).

Examples: n-Hexane and n-heptane, bromoethane and chloroethane, benzene and toluene

Non-Ideal Solutions

Solutions which do not obey Raoult's law over the entire range of concentration

The vapour pressure of a non-ideal solution is either higher or lower than that predicted by Raoult's law.

ΔH _mix ≠ 0

Δ V _mix ≠ 0

Solution showing positive deviation from Raoults law