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The correct relationship between the boi...

The correct relationship between the boiling point of very dilute solutions of `AiCI_(3)(t_(1))` and `caCI_(2)(t_(2))` having the same molar concentration is:

A

`t_(1) = t_(2)`

B

`t_(1) gt t_(2)`

C

`t_(2) gt t_(1)`

D

`t_(2) ge t_(1)`

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The correct Answer is:
To solve the problem, we need to analyze the boiling point elevation of very dilute solutions of \( \text{AlCl}_3 \) and \( \text{CaCl}_2 \) with the same molar concentration. ### Step-by-Step Solution: 1. **Understand the Concept of Boiling Point Elevation**: The boiling point elevation (\( \Delta T_b \)) of a solution is given by the formula: \[ \Delta T_b = i \cdot m \cdot K_b \] where: - \( i \) = van 't Hoff factor (number of particles the solute breaks into) - \( m \) = molality of the solution (which is the same for both solutions in this case) - \( K_b \) = ebullioscopic constant of the solvent (also the same for both solutions) 2. **Determine the van 't Hoff Factor (\( i \)) for Each Solute**: - For \( \text{AlCl}_3 \): \[ \text{AlCl}_3 \rightarrow \text{Al}^{3+} + 3 \text{Cl}^- \] This dissociates into 4 ions (1 aluminum ion and 3 chloride ions), so: \[ i_{\text{AlCl}_3} = 4 \] - For \( \text{CaCl}_2 \): \[ \text{CaCl}_2 \rightarrow \text{Ca}^{2+} + 2 \text{Cl}^- \] This dissociates into 3 ions (1 calcium ion and 2 chloride ions), so: \[ i_{\text{CaCl}_2} = 3 \] 3. **Compare the Values of \( i \)**: Since both solutions have the same molality (\( m \)) and the same \( K_b \), the boiling point elevation will depend solely on the van 't Hoff factor (\( i \)): \[ \Delta T_{b,\text{AlCl}_3} = i_{\text{AlCl}_3} \cdot m \cdot K_b \] \[ \Delta T_{b,\text{CaCl}_2} = i_{\text{CaCl}_2} \cdot m \cdot K_b \] - Since \( i_{\text{AlCl}_3} = 4 \) and \( i_{\text{CaCl}_2} = 3 \): \[ \Delta T_{b,\text{AlCl}_3} > \Delta T_{b,\text{CaCl}_2} \] 4. **Relate the Boiling Points**: The boiling point of a solution increases with the elevation: \[ T_{b,\text{AlCl}_3} = T_{b,\text{pure solvent}} + \Delta T_{b,\text{AlCl}_3} \] \[ T_{b,\text{CaCl}_2} = T_{b,\text{pure solvent}} + \Delta T_{b,\text{CaCl}_2} \] Since \( \Delta T_{b,\text{AlCl}_3} > \Delta T_{b,\text{CaCl}_2} \), it follows that: \[ T_{b,\text{AlCl}_3} > T_{b,\text{CaCl}_2} \] 5. **Final Conclusion**: Therefore, the correct relationship between the boiling points of the two solutions is: \[ T_1 > T_2 \] where \( T_1 \) is the boiling point of the \( \text{AlCl}_3 \) solution and \( T_2 \) is the boiling point of the \( \text{CaCl}_2 \) solution. ### Answer: The correct relationship is \( T_1 > T_2 \).

To solve the problem, we need to analyze the boiling point elevation of very dilute solutions of \( \text{AlCl}_3 \) and \( \text{CaCl}_2 \) with the same molar concentration. ### Step-by-Step Solution: 1. **Understand the Concept of Boiling Point Elevation**: The boiling point elevation (\( \Delta T_b \)) of a solution is given by the formula: \[ \Delta T_b = i \cdot m \cdot K_b ...
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ALLEN-SOLUTIONS-EXERCISE -01
  1. Boiling point of water is defined as the temperature at which:

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  2. Which solution will show maximum elevation in b.pt:

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  3. The correct relationship between the boiling point of very dilute solu...

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  4. Cryoscopic constant of a liquid is:

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  5. At certain Hill-station pure water boils at 99.725^(@)C. If K(b) for w...

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  6. The freezing point of 1 molal NaCl solution assuming NaCl to be 100% d...

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  7. 10 gram of solute with molecular mass 100 gram mol^(-1) is dissolved i...

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  8. Depression in freezing point of solution of electrolytes are generally

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  9. A liquid is in equilibrium with its vapour at its boiling point. On av...

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  10. Which salt may show the same value of vant Hoff factor (i)as that of K...

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  11. Which of the following compounds corresponds to van’t Hoff factor (i) ...

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  12. In which of the following the vant Hoff factor (i) is equal to one:

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  13. If the observed and theoretical molecular mass of NaCI is found to be ...

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  14. The substance A when dissolved in solvent B shows the molecular mass c...

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  15. Which of the following conditions is not correct for ideal solution:

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  16. Solution distilled without change in composition at a temperature is c...

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  17. If mole fraction of the solvent in a solution decreases than:

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  18. An azeotropic solution of two liquid has boiling point lower than eith...

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  19. The passing of solvent particles through semipermeable membrane is cal...

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  20. From the colligative properties of solution which one is the best meth...

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