______ states that for a solution of volatile liquids, the partial vapour pressure of each component of the solution is directly proportional to its mole fraction present in solution.

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______ states that for a solution of volatile liquids, the partial vapour pressure of each component of the solution is directly proportional to its mole fraction present in solution.

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SSC CPO Previous Paper 37 (Held On: 24 November 2020 Shift 2)

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Boyle’s law
Dalton’s law
Faraday’s law
Raoult’s law

Answer 1

The correct answer is Raoult’s law.

Raoult’s law states that a solvent’s partial vapour pressure in a solution (or mixture) is equal or identical to the vapour pressure of the pure solvent multiplied by its mole fraction in the solution.

Mathematically, Raoult’s law equation is written as;

P_solution = Χ_solventP⁰_solvent

Where,

Psolution = vapour pressure of the solution
Χ_solvent = mole fraction of the solvent
P⁰_solvent = vapour pressure of the pure solvent

Important Points

Boyle’s law	Boyle’s law, also called Mariotte’s law, a relation concerning the compression and expansion of a gas at a constant temperature. The pressure exerted by a gas (of a given mass, kept at a constant temperature) is inversely proportional to the volume occupied by it. The pressure (P) of a given quantity of gas varies inversely with its volume (V) at constant temperature; i.e., in equation form, PV = k, a constant.
Dalton’s law	The Law of Partial Pressures, states that the total pressure exerted by a mixture of gases is equal to the sum of the partial pressures of the gases in the mixture.
Faraday’s law	Faraday's law of induction (Faraday's law) is a basic law of electromagnetism predicting how a magnetic field will interact with an electric circuit to produce an electromotive force (EMF) - a phenomenon known as electromagnetic induction. Faraday's law states that the EMF is also given by the rate of change of the magnetic flux: $\text{[math]}$ where E is the electromotive force (EMF) and ΦB is the magnetic flux.

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______ states that for a solution of volatile liquids, the partial vapour pressure of each component of the solution is directly proportional to its mole fraction present in solution.

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