Advertisements
Advertisements
प्रश्न
How is the sign of ΔmixH related to positive deviations from Raoult’s law?
Advertisements
उत्तर
For solutions showing positive deviation from Raoult’s law, `Delta H_"mixing" > 0`. This can be explained as follows:
More energy is needed to overcome A-A or B-B interaction forces than is released during the setup of A-B interaction forces during solution formation because the A-B molecular interaction forces are weaker than the A-A or B-B interaction forces. Heat is thus absorbed during the creation of such a solution, and the dissolution process is endothermic. For this reason, `Delta H_"mixing"` is advantageous in this instance.
संबंधित प्रश्न
What type of intermolecular attractive interaction exists in the pair of methanol and acetone?
Which one of the following is incorrect for an ideal solution?
The mass of a non – volatile solute (molar mass 80 g mol-1) should be dissolved in 92g of toluene to reduce its vapour pressure to 90% ______.
Which solution has the lower freezing point? 10 g of methanol (CH3OH) in 100g g of water (or) 20 g of ethanol (C2H5OH) in 200 g of water.
For ideal solution the volume of mixing of the pure components to form the solution is ____________.
Which relationship is not correct?
If two liquids A and B form minimum boiling azeotrope at some specific composition then ______.
Intermolecular forces between two benzene molecules are nearly of same strength as those between two toluene molecules. For a mixture of benzene and toluene, which of the following are not true?
(i) ∆mix H = zero
(ii) ∆mix V = zero
(iii) These will form minimum boiling azeotrope.
(iv) These will not form ideal solution.
Concentration terms such as mass percentage, ppm, mole fraction and molality are independent of temperature, however molarity is a function of temperature. Explain.
Why soda water bottle kept at room temperature fizzes on opening?
Assertion: Molarity of a solution in liquid state changes with temperature.
Reason: The volume of a solution changes with change in temperature.
Assertion: When a solution is separated from the pure solvent by a semipermeable membrane, the solvent molecules pass through it from pure solvent side to the solution side.
Reason: Diffusion of solvent occurs from a region of high concentration solution to a region of low concentration solution.
Upon increase in pressure for dissociation N2O4 into NO2, equilibrium shift towards
Which of the following gave the idea of a nucleus of the atom?
While titration dilute HCl solution with aqueous NaOH, which of the following will not be required?
1 mole of liquid A and 2 moles of liquid B make a solution having a total vapour pressure of 40 torr. The vapour pressure of pure A and pure B are 45 torr and 30 torr, respectively. The above solution ______.
What type of deviation from Roult’s Law is expected when phenol and aniline are mixed with each other? What change in the net volume of the mixture is expected? Graphically represent the deviation.
Suggest the most important type of intermolecular attractive interaction in the following pair.
n-hexane and n-octane
5 moles of liquid X and 10 moles of liquid Y make a solution having a vapour pressure of 70 torr. The vapour pressures of pure X and Y are 63 torr and 78 torr respectively. Which of the following is true regarding the described solution?
