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Van't Hoff factor and degree of dissociation

This type of question, asked 5 times: 19 Apr 2025 S1, 15 Apr 2026 S1, 19 Apr 2026 S1, 12 May 2026 S1, 15 May 2026 S1. All 5 questions below, oldest first.

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  1. Question 1

    19 Apr 2025 S1

    54
    Calculate the percent dissociation of 0.02 m solution if its freezing point depression is 0.046 K .[Kf\left\lbrack K_{f} \right. for water  =1.86 K kg mol−1;n=2]\left. \ = 1.86\text{ }K\text{ }kg{\text{ }mol}^{- 1};n = 2 \right\rbrack

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  2. Question 2

    15 Apr 2026 S1

    21
    Calculate the van't Hoff factor of a centimolar solution of potassium ferrocyanide if it is 60%60\% dissociated at 300300 K.

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  3. Question 3

    19 Apr 2026 S1

    23
    Van't Hoff factor for BaCl2\mathrm{BaCl_2} is 2.472.47, calculate the percentage dissociation of in its aqueous solution.

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  4. Question 4

    12 May 2026 S1

    19
    Calculate the amount of KCl that should be added to 100100 g of pure water to decrease the freezing point of water by 0.35350.3535 K, if KfK_f for water is 1.86 K kg mol−11.86\ \mathrm{K\,kg\,mol^{-1}}. [Degree of dissociation of KCl (α)=0.9(\alpha) = 0.9, Molar mass of KCl =74.5= 74.5 g/mol]

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  5. Question 5

    15 May 2026 S1

    20
    Calculate the percent of dissociation of 0.01m0.01\mathrm{m} aqueous solution of K3[Fe(CN)6]\mathrm{K_3[Fe(CN)_6]} that freezes at −0.062∘C-0.062^\circ\mathrm{C}. [Kf=1.8 K kg mol−1K_f = 1.8\ \mathrm{K\ kg\ mol^{-1}}]

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