Which of the following can be measured by the Ostwald-Walker dynamic method(a) Vapour pressure of the solvent(b) Relative lowering of vapour pressure(c) Lowering of vapour pressure(d) All of these

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Q. Which expression of relative lowering of vapour pressure is correct:
delta P/initial vapour pressure of the solvent(P^0)
OR
DeltaP/vapour pressure of solution(Ps)

Q. Assertion :Relative lowering of vapour pressure is equal to the mole fraction of the solvent
Reason:

Relative lowering of vapour pressure is a colligative property

If the vapour pressure of pure solvent A is 17.5 mm and lowering of vapour pressure of solution formed by adding a non-volatile electrolyte is 0.0175 mm then what is the relative lowering of vapour pressure?

Q. Assertion :Lowering of vapour pressure is not dependent on the number of species present in the solution. Reason: Lowering of vapour pressure and relative lowering of vapour pressure are colligative properties.

Q. From relative lowering of vapour pressure , molecular mass of non-volatile solute can be determined.
Which of the following relations is correct?
Here,

P_{A}^{\circ} is vapour pressure of pure solvent

P_{S} is vapour pressure of solution

w_{A}, w_{B} are mass of solvent and solute respectively

M_{A}, M_{B} are molecular masses of solvent and solute respectively

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