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Select correct statement : a. Solutio...

Select correct statement :
a. Solution has more molecules randomness than a pure solvent. The entropy change between solution and solid is lager than the entropy change between pure solvent and solid.
b. Heat of fusion of solution are positive
c. Both a and b
d. None of these

A

Solution has more molecules randomness than a pure solvent. The entropy change between solution and solid is lager than the entropy change between pure solvent and solid

B

Heat of fusion of solution are positive

C

both a and b

D

none of these

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question, we need to evaluate the given statements regarding solutions and their properties. Let's analyze each option step by step. ### Step 1: Analyze Statement A **Statement A:** "Solution has more molecules randomness than a pure solvent. The entropy change between solution and solid is larger than the entropy change between pure solvent and solid." - A solution consists of both solute and solvent particles, leading to a greater number of molecules compared to a pure solvent, which only contains solvent molecules. - More particles in a solution contribute to higher randomness (or entropy). - The entropy change (ΔS) when a solid dissolves into a solution is indeed larger than the entropy change when a pure solvent transitions to a solid because the number of configurations available to the system increases when solute is added. **Conclusion for Statement A:** This statement is correct. ### Step 2: Analyze Statement B **Statement B:** "Heat of fusion of solution is positive." - The heat of fusion (ΔH_fusion) is the energy required to change a substance from solid to liquid at its melting point. - For solutions, when a solid solute dissolves, energy is absorbed to break the intermolecular forces in the solid, which typically results in a positive heat of fusion. - Thus, when considering the fusion of a solution, it is indeed true that the heat of fusion is positive due to the energy required to overcome the interactions between solute and solvent. **Conclusion for Statement B:** This statement is also correct. ### Step 3: Evaluate the Options Now that we have analyzed both statements: - **Option A** is correct. - **Option B** is correct. - **Option C** states that both A and B are correct. - **Option D** states that none of these are correct. Since both statements A and B are correct, the correct answer is: **Final Answer:** Option C (Both A and B are correct). ---
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A system of greater disorder of molecules is more probable. The disorder of molecules is reflected by the entropy of the system. A liquid vapourizes to form a more disordered gas. When a solute is present, there is additional contribution to the entropy of the liquid due to increased randomness. As the entropy of solution is higher than that of pure liquid, there is weaker tendency to form the gas. Thus, a solute (non-volatile) lowers the vapour pressure of a liquid, and hence a higher boiling point of the solution. Similarly, the greater randomness of the solution opposes the tendercy to freeze. In consequence, a lower temperature must be reached for achieving the equilibrium between the solid (frozen solvent) and the solution. The elevation in boiling point (DeltaT_(b)) and depression in freezing point (DeltaT_(f)) of a solution are the colligative properties which depend only on the concentration of particles of the solute and not their identity. For dilute solutions, (DeltaT_(b)) and (DeltaT_(f)) are proportional to the molarity of the solute in the solution. Dissolution of a non-volatile solute into a liquid leads to

A system of greater disorder of molecules is more probable. The disorder of molecules is reflected by the entropy of the system. A liquid vapourizes to form a more disordered gas. When a solute is present, there is additional contribution to the entropy of the liquid due to increased randomness. As the entropy of solution is higher than that of pure liquid, there is weaker tendency to form the gas. Thus, a solute (non-volatile) lowers the vapour pressure of a liquid, and hence a higher boiling point of the solution. Similarly, the greater randomness of the solution opposes the tendercy to freeze. In consequence, a lower temperature must be reached for achieving the equilibrium between the solid (frozen solvent) and the solution. The elevation in boiling point (DeltaT_(b)) and depression in freezing point (DeltaT_(f)) of a solution are the colligative properties which depend only on the concentration of particles of the solute and not their identity. For dilute solutions, (DeltaT_(b)) and (DeltaT_(f)) are proportional to the molarity of the solute in the solution. A mixture of two immiscible liquids at a constant pressure of 1.0 atm boils at temperature

NARENDRA AWASTHI ENGLISH-DILUTE SOLUTION-leval-03
  1. Select correct statement : a. Solution has more molecules randomnes...

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  2. Lowering in vapour pressure is determined by Ostwald and Walker dynami...

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  3. Lowering in vapour pressure is determined by Ostwald and Walker dynami...

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  4. Lowering in vapour pressure is determined by Ostwald and Walker dynami...

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  5. Lowering in vapour pressure is determined by Ostwald and Walker dynami...

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  6. A dilute solution contains 'x' moles of solute A in 1 kg of solvent wi...

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  7. A dilute solution contains 'x' moles of solute A in 1 kg of solvent wi...

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  8. Which of the following statement(s) is/are correct, if intermolecular ...

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  9. When non-volatile solute is added to a pure solvent, the:

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  10. The total vapour pressure of a binary solution is gives by P = (100X(...

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  11. Which of the following is correct for an ideal solution?

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  12. Which of the following is correct for a non-ideal solution of liquids ...

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  13. A binary solution of liquids A and B will show positive deviation from...

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  14. Which of the following statement is/are correct about acetone and tric...

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  15. The azeotropic solution of two miscible liquids:

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  16. For exact determination of molecular mass through colligative properti...

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  17. In the depression of freezing point experiment, it is found that the:

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  18. The cryoscopic constant value depends upon:

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  19. Consider 0.1 M solutions of two solutes X and Y. The solute X behaves...

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  20. Consider following solutions: (I) I M glucose(aq) (II) 1 M so...

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  21. Which of the following statement is (are) incorrect?

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