`MX_(2)` dissociates into `M^(2+)` and `X^(-)` ions in an aqeous solution, with a degree 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 the absence of ionic dissociation is

Explanation

`Mx_(2)overset((aq))hArrM^(2+)(aq)+2X^(-)(aq)`
`"Degree of dissociation"(alpha)=(i-1)/(n-1)`
`0.5=(i-1)/(3-1)=(i-1)/2or i=0.5xx2+1=2`
I gives the ratio of observed depression in freezing point to the normal depression in freezing point value
The ratio is 2