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MX(2) dissociates into M^(2+) and X^(ө) ...

`MX_(2)` dissociates into `M^(2+)` and `X^(ө)` ion in an aqueous solution, with a degree of dissociation `(alpha)` of `0.5`. The ratio of the observed depression of freezing point of the aqueous solution to the value of the depression of freezing point in absence of ionic dissociation is

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Text Solution

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The correct Answer is:
B
`MX_(2) rarr M^(2+) +2X^( ө)`
`{:(1,0,0),(1-alpha,alpha,2alpha):}`
`i=1-alpha +alpha + 2alpha=1 + 2alpha =1 + 2 xx 0.5 =2`
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