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Assignments Week-4

1. The liquid form of a pure substance A contained in a sealed vessel in which it is in equilibrium with its vapor form. The correct statement about its chemical potential is:

(A) The chemical potential of A in its vapor form is higher than that in its liquid form (B) The chemical potential of A in its vapor form is lower than that in its liquid form (C) The chemical potential of A in its vapor form is equal to that in its liquid form (D) The chemical potential of A in its vapor form is zero

2. In an ideal solution, the slope of the plot of vapor pressure of solvent against its mole fraction is

(A) Vapor pressure of pure solute (B) Vapor pressure of pure solvent (C) Molality of the solution

(D) Temperature of the solution

3. In a solution formed by mixing two liquids, positive deviations from ideality are observed if (A) The dipolar interactions between solute and solvent molecules are weaker than those

between solute-solute and solute-solvent molecules (B) Solute-solvent do not interact with each other

(C) The dipolar interactions between solute and solvent molecules are stronger than those between solute-solute and solute-solvent molecules

(D) Either the solute or the solvent is non-volatile

4. If both the solute and solvent obey Raoult’s law, the solution is (A) An ideal solution

(B) A non-ideal solution (C) An ideal dilute solution (D) A regular solution

5. If the free energy of mixing of two liquids is always positive, the resulting solution is (A) Immiscible form of mixture of both the liquids

(B) Miscible form of both the liquids

(C) Partially miscible form of both the liquids (D) In vapor form of both the liquids

(2)

6. Which of the following does not depend upon temperature?

(A) mixG (B) mixS (C) mixH (D) G(excess) (E)

7. Excess functions are indicative of

(A) Intermolecular interactions operating in solution (B) Non-ideality exhibited by solution

(C) Ability of liquids to mix

(D) Significant deviation of activity coefficient from unity

8. If water is mixed with ethanol, excess enthalpy is expected to be (A) Positive

(B) Negative (C) Zero

(D) Either positive or negative depending upon temperature

9. Existence of intermolecular interaction in a solution can be confirmed by measuring (A) Heat capacity of solution

(B) Gibbs energy of mixing (C) Volume change upon mixing

(D) Change in molecular weight of mixing liquids

10. Entropy of mixing of two liquids will not change if (A) Temperature is changed

(B) Pressure is changed (C) Volume is changed

(D) Amount of mixing liquids is changed

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