Question

Equimolar solution in the same solvent will have:
(a)- Different boiling and different freezing point
(b)- Same boiling and same freezing point
(c)- Same freezing point but the different boiling point
(d)- Same boiling point but different freezing point

Answer 1

Both the boiling point and the freezing point are colligative properties or those properties which depend only on the number of moles of the solute in the solution. If the solutions have the same moles the properties of the solution will also be the same.

Complete step-by-step answer: We can define the molarity of the solution as the amount or number of moles present in 1 liter of the solution. So, as the mole of the solute increases in the solution, the molarity of the solution also increases. Equimolar solutions in the same solvent mean there are two solutions having the same solvent but different solutes in the same amount.
There are some properties like boiling point, freezing point, osmotic pressure, vapor pressure are the colligative properties and colligative properties are those which depend only on the number of moles in the solution.
So, in an equimolar solution, both the solvents are having the same amount or number of moles, therefore, all the colligative properties also remain the same.
So, in the options given boiling and freezing point are there and these both are colligative properties. Therefore, two equimolar solutions having the same solvent will have the same boiling and freezing point.

Hence, the correct answer is an option (b).

Note: The boiling point of the solution is when the liquid state starts to convert into a vapor state and for the solution, it is higher than the pure solvent. The freezing point of the solution is when the liquid state starts to convert into the solid-state for the solution is lower than the pure solvent.