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Question:

MX2 dissociates in M²⁺ and X⁻ ions in an aqueous solution with a degree of dissociation 0.5 (α). The ratio of the observed depression of the freezing point of the aqueous solution to the value of the depression of freezing point in the absence of ionic dissociation is ______.

Solution:

MX₂⇌M²⁺+2X⁻
α α 2α
Where, α is the degree of dissociation.
i=1+2α
α=0.5
Therefore, i=2.