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Physical Nature of Matter

Does the valu...

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Does the value of pure vapour pressure of volatile solvent changes with change in temperature ?

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Q. The vapour pressure of an ideal solution having 0.2 mole non-volatile solute and 0.8 mole solvent is 60 mm. The vapour pressure of pure solvent at this temperature will be:

Q. A non-volatile solute

(A)

is dissolved in a volatile solvent

(B)

. The vapour pressure of the solution is

P_{s}

. The vapour pressure of the pure solvent is

P_{B}^{0}

X

is mole fraction then which of the following is correct?

12 g

of non volatile solute having

(Molar mass = 120 g / m o l)

was dissolved in

9.9 m o l

of solvent. If the vapour pressure of pure solvent is

P_{A}^{\circ},

the vapour pressure of solution is:

The following are some statements about vapour pressure.

I. Vapour pressure of a solution increases with increase in temperature.

II. Liquids with high vapour pressure even at ordinary temperatures are volatile liquids.

III. The temperature at which vapour pressure of solution is equal to atmospheric pressure is called boiling point.

IV. When a non-volatile solute is dissolved in a volatile solvent, its vapour pressure decreases.

Which of the above is/are correct?

Q. Which of the following is correct regarding vapour pressure of the solution formed when a non-volatile solute (solid) is added in a pure volatile solvent?

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