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प्रश्न
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 ______.
पर्याय
is an ideal solution
shows positive deviation
shows negative deviation
is a maximum boiling azeotrope
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उत्तर
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 shows positive deviation.
Explanation:
If the actual pressure is lower than the expected pressure, the solution will have a negative deviation. If the actual pressure is greater than the expected pressure, the solution will display a positive deviation. If the actual pressure equals the expected pressure, the solution will be ideal.
XA = `1/(1 + 2) = 1/3`
XB = `2/(1 + 2) = 2/3`
PT = `"P"_"A"^0 xx "A" + "P"_"B"^0 xx "B"`
= `45 xx 1/3 + 30 xx 2/3`
= 35 torr
However, the actual pressure i.e. 40 torr, is greater than the expected pressure. As a result, the solution will have a positive deviation.
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संबंधित प्रश्न
Fill in the blanks by choosing the appropriate word/words from those given in the brackets:
Ideal solutions obey ………. law and they …………. form azeotropic mixtures.
(Henry’s, aldol condensation, absence, do not, ohm, Raoult’s, increases, common ion effect, easily, three, solubility product, ohm-1, two, four, ohm-1, cm2, Cannizzaro, ohm-1 cm-1, zero, decreases, presence)
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Reason: In an ideal solution, solvent – solvent as well as solute – solute interactions are similar to solute-solvent interactions.
State Raoult law and obtain the expression for lowering of vapour pressure when the nonvolatile solute is dissolved Insolvent.
For ideal solution the volume of mixing of the pure components to form the solution is ____________.
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Reason: The volume of a solution changes with change in temperature.
Explain the terms ideal and non-ideal solutions in the light of forces of interactions operating between molecules in liquid solutions.
Assertion (A): The enthalpy of mixing Δmix H is equal to zero for an ideal solution.
Reason (R): For an ideal solution the interaction between solute and solvent molecules is stronger than the interactions between solute-solute or solvent-solvent molecules.
