Home
Class 12
CHEMISTRY
STATEMENT-1 : When Hgl(2) is added to th...

STATEMENT-1 : When Hgl_(2)` is added to the aqueous solution of Kl, the freezing point is raised.
and
STATEMENT-2 : Freezing p[oint genarally increases by adding non volatile solute in solvent.

A

Statement-1 is True, Statement-2 is True, Statement-2 is a correct explanation for Statement-3

B

Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation for Statement-3

C

Statement-1 is True, Statement-2 is False

D

Statement-1 is False, Statement-2 is True

Text Solution

AI Generated Solution

The correct Answer is:
To solve the problem, we need to analyze both statements provided and determine their validity based on the principles of colligative properties in solutions. ### Step-by-Step Solution: 1. **Understanding Statement 1**: - The statement claims that when HgI2 (mercury(II) iodide) is added to an aqueous solution of KI (potassium iodide), the freezing point is raised. - When HgI2 is added to KI, a complex K2HgI4 is formed. This reaction decreases the number of particles (ions) in the solution. 2. **Colligative Properties**: - The freezing point depression can be calculated using the formula: \[ \Delta T_f = i \cdot K_f \cdot m \] where: - \(\Delta T_f\) = depression in freezing point - \(i\) = Van't Hoff factor (number of particles the solute breaks into) - \(K_f\) = molal freezing point depression constant - \(m\) = molality of the solution 3. **Analyzing Ion Count**: - In the case of KI, it dissociates into K⁺ and I⁻ ions, giving a total of 2 ions. - When HgI2 is added, it forms a complex K2HgI4, which has fewer ions than the original solution. Therefore, the total number of particles in the solution decreases. 4. **Effect on Freezing Point**: - Since the Van't Hoff factor \(i\) decreases (fewer particles), the term \(i \cdot K_f \cdot m\) also decreases. - This means that the depression in freezing point (\(\Delta T_f\)) is less, which implies that the freezing point of the solution increases. 5. **Conclusion for Statement 1**: - Therefore, Statement 1 is **true**: the freezing point is raised when HgI2 is added to KI. 6. **Understanding Statement 2**: - The second statement claims that the freezing point generally increases by adding a non-volatile solute to a solvent. - Non-volatile solutes do not vaporize and thus do not contribute to vapor pressure. When a non-volatile solute is added, the vapor pressure of the solvent decreases. 7. **Effect on Freezing Point**: - A decrease in vapor pressure results in an increase in boiling point and a decrease in freezing point. Therefore, the addition of a non-volatile solute typically lowers the freezing point of the solution. 8. **Conclusion for Statement 2**: - Thus, Statement 2 is **false**: the freezing point does not increase; it decreases when a non-volatile solute is added. ### Final Answer: - Statement 1 is true, and Statement 2 is false.
Promotional Banner

Topper's Solved these Questions

  • SOLUTIONS

    AAKASH INSTITUTE ENGLISH|Exercise ASSIGMENT (SECTION-F ) MATRIX-MATCHTYPE QUESTIONS|5 Videos
  • SOLUTIONS

    AAKASH INSTITUTE ENGLISH|Exercise ASSIGMENT (SECTION-G) INTEGER ANSWER TYPE QUESTIONS|5 Videos
  • SOLUTIONS

    AAKASH INSTITUTE ENGLISH|Exercise ASSIGMENT (SECTION-D ) LINKED COMPRESHENSION TYPE QUESTIONS|6 Videos
  • REDOX REACTIONS

    AAKASH INSTITUTE ENGLISH|Exercise ASSIGNMENT SECTION - D|10 Videos
  • SOME BASIC CONCEPT OF CHEMISTRY

    AAKASH INSTITUTE ENGLISH|Exercise ASSIGNMENT( SECTION - D) Assertion-Reason Type Questions|15 Videos

Similar Questions

Explore conceptually related problems

When mercuric iodide is added to an aqueous solution of Kl the

When Na_(2)CO_(3) is added to an aqueous solution of CuSO_(4)

1% aqueous solution of Ca(NO_(3))_(2) has freezing point

When HgI_(2) is added in KI solution. The freezing point of solution:-

Why is freezing point depressed when a non-volatile solute is added to a solvent ?

Which one of the following aqueous solution has the highest freezing point at 1 atm:

Addition of Hgl_(2) to the aqueous solution of Kl shows an icrease in the osmotic pressure, why?

Statement-I: When mercuric iodide(s) is added to the aqueous solution of KI , the freezing point is raised. Because Statement-II: HgI_(2) reacts with KI forming complex ion [Hg]_(4)^(2-)

Which of the following 0.2m aqueous solutions will show minimum freezing point :-

Which of the following 0.1 M aqueous solutions will have the lowest freezing point?